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September 17, 2014

Homework Help: Science: Outer Space

Recent Homework Questions About Outer Space

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English
Thank you very much for your corrections! Here are other statements on the same newspaper article. 1) The cheetah reintroduction programme is kicking off (starting?) with a meeting of experts in September. 2) The project includes the foundation of a breeding site in which ...
Monday, October 31, 2011 at 7:50am

****college algebra****
Let h(x) = 3x + 4. For what value of x is (h o h)(x) = h(x). If no such value exists, type DNE in the space provided.
Sunday, October 30, 2011 at 11:08pm

****college algebra****
Let g(x) = -2x + 8 and h(x) = 3x + 4. For what value of x is composition (g o h)(x) = (h o g)(x). If no such value exists, type in DNE in the space provided.
Sunday, October 30, 2011 at 11:00pm

hvac
gas trapped in a reciprocating piston compressors clearance space expands at the beginning of the suction stroke what effect does this have on the system
Saturday, October 29, 2011 at 11:25pm

Physics
An astronaut in outer space pushes himself away from his spaceship. About how far does the astronaut go before stopping? What does the astronaut have to do to stop himself?
Friday, October 28, 2011 at 2:33pm

HW CHECK
What is the verb in the following sentence? (only one answer) 1. Many people believe that the economy is not the worst problem in America. a. Many b. believe c. is d. is not e. in What is the subject in the following sentence? (may be one or more) 2. Her problems, her ...
Wednesday, October 26, 2011 at 7:36pm

physics
An astronaut in her space suit has a total mass of m1 = 69.7 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her oxygen tank of mass m2 = 12....
Tuesday, October 25, 2011 at 11:51pm

Decimal problem #2
The glass mirror of the Hubble telescope had to be repaired in space because it would not focus properly. The problem was that the mirror's outer edge had a thickness of 0.6248 cm when it was supposed to be 0.625 cm. Was the edge too thick or thin? By how much?
Monday, October 24, 2011 at 6:21pm

statistics
government data assign a single case or each death that occurs in the u.s. the data show that the probability is 0.45 that a randomly chosen death was due to cardiovascular disease, and 0.22 that i was due to cancer. Suppose a docote checked the cause of death of 2 randomly ...
Monday, October 24, 2011 at 2:12pm

c++ program
how can a modfiy this source code to a menu. #include <stdio.h> #include <stdlib.h> #include <time.h> main() { char cYesNo = '\0'; int iResp1 = 0; int iResp2 = 0; int iResp3 = 0; int iElaspedTime = 0; int iCurrentTime = 0; int iRandomNum = 0; int i1...
Monday, October 24, 2011 at 12:18pm

geography
Which statements describe cultural influences? Florida is bordered by water on three sides. French is spoken in parts of Louisiana. Forests are cleared to provide space for cattle grazing. Male children are encouraged to attend the university. The longest river on the ...
Monday, October 24, 2011 at 10:40am

Physics
Please help me with these choose the best answers since I'm not sure of my answers. A current element produces a magnetic field in the region surrounding it. at any point in space, the magnetic field produced by this current element points in a direction that is a) radial ...
Sunday, October 23, 2011 at 10:02pm

Physics
Please help me with these choose the best answers since I'm not sure of my answers. A current element produces a magnetic field in the region surrounding it. at any point in space, the magnetic field produced by this current element points in a direction that is a) radial ...
Sunday, October 23, 2011 at 9:31pm

Physics
Hi,I need help with question 1) There were twins on our planet earth. They were physicst. One of them were sent to space at his 20 year. When he comes back after 20 years of stay in the space he was 40 years but his brother who stayed on earth was 60 years old. How can it be? ...
Sunday, October 23, 2011 at 1:36am

Math
A tile is 38 cm long and the space between the tiles is 0.8. How many tiles are required to build a floor 5.82 m long?
Wednesday, October 19, 2011 at 6:27am

Math
A tile is 38 cm long and the space between the tiles is 0.8. How many tiles are required to build a floor 5.82 m long?
Wednesday, October 19, 2011 at 6:20am

math
a farmer can afford 8000 square meters of fence and would like to come up with the best way to use this fence, such that: - he wants all the pens to be of the same rectangular shape. - he wants to give each calce of his farm as much space as possible. - he needs an easy access...
Wednesday, October 19, 2011 at 2:08am

trig
A water-park slide covers 100 feet of horizontal space and is 36 feet high. A new replacement slide will create an angle with the water surface that measures twice that of the original slide. The new slide will use the same horizontal space as the old slide. What is the height...
Tuesday, October 18, 2011 at 4:23pm

physics
A piece of modeling clay is motionless in space. Another piece of clay that is 4 times as massive moving at 10m/s collides with it and sticks to it. What is the momentum of the combined blob after the collision?
Tuesday, October 18, 2011 at 3:54am

university physics
It is proposed that future space stations create an artificial gravity by rotating. Suppose a space station in constructed as a 1170.0 m diameter cylinder that rotates about its axis. The inside surface is the deck of the space station. What rotation period (in s) will provide...
Monday, October 17, 2011 at 8:36pm

Writing
I'm not sure how to edit this business letter. Please help! I'm not sure what to do when there is an address for another business? Please help edit paper! Thank you! Dear Ms. Drager: In connection with an examination of our financial statements by Templeton and ...
Monday, October 17, 2011 at 2:17pm

Physics 1 - Mechanics
You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, which is 420 km above the Earth, but he is 21 km ahead of you. (a) How long will it take you to catch up with your friend if you reduce your...
Friday, October 14, 2011 at 12:48pm

physics
The space shuttle has a total mass of 2.0 x 10^6 kg. At liftoff, the engines exert a total thrust of 35 x 10^6 N. Calculate teh shuttle's weight. Calculate the shuttle's acceleration at liftoff. If the acceleration averages 13 m/s/s over the first 10 minutes, what ...
Friday, October 14, 2011 at 11:35am

Grammar
What exsits or orcurrs in space that is 19 spaces long. The sencond letter is a P. The 9 letter is a R, the 12th letter n and the last letter is n. Thank you.
Thursday, October 13, 2011 at 6:20pm

physics
A space vehicle is coasting at a constant velocity of 20.7 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.260 m/s2 in the +x direction. After 42.0 s, the pilot ...
Thursday, October 13, 2011 at 11:25am

physics
( 1.) A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?< (A) The passenger is in motion relative to the passer-by (B) The passer-by is stationery relative to the ...
Wednesday, October 12, 2011 at 11:51am

computers
TMA1PHY111 ( 1.) A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?< (A) The passenger is in motion relative to the passer-by (B) The passer-by is stationery relative ...
Wednesday, October 12, 2011 at 11:49am

Mathematics
Images on a computer can be stored many ways to account for quality and space issues. One of the factors we can adjust is colour depth. Colour depth determines the number of bits we use for each pixel of an image. The pixels are the small dots that make up an image. The higher...
Tuesday, October 11, 2011 at 9:23pm

physics
Two children float motionlessly in a space station. The 20-kg girl pushes on the 40-kg boy and he sails away at 1.0m/s. What happens to the girl?
Tuesday, October 11, 2011 at 9:03pm

physics
A rocket consists of a payload of 4280.0 kg and 1.626 105 · of fuel. Assume that the rocket starts from rest in outer space, accelerates to its final velocity, and then begins its trip. What is the speed at which the propellant must be expelled to make the trip from the...
Tuesday, October 11, 2011 at 9:44am

probability
A random experiment of tossing a die twice is performed. Random variable X on this sample space is defined to be the sum of two numbers turning up on the toss. Find the discrete probability distribution for the random variable X and compute the corresponding mean and standard ...
Tuesday, October 11, 2011 at 6:04am

chemistry
An 27 liter indoor air sample is collected in a Tedlar bag in the crawl space of a building built on an old municipal dump. There is a suspicion that methylene chloride vapor may be seeping into the building. The temperature is 32¢K and the pressure is 767.6 millimeters ...
Tuesday, October 11, 2011 at 4:46am

math
The fuel rods for a certain type of nuclear reactor are bundled into a cylindrical shell. Consider this cross-section showing 19 identical fuel rods: a) If the diameter of the cylindrical shell is 12.35 cm, calculate the shaded area of the cross-section. b) If the length of ...
Monday, October 10, 2011 at 7:15pm

Physics
What is the maximum total force exerted on a 78 kg astronaut by her seat during the launch of the Space Shuttle?
Monday, October 10, 2011 at 6:43pm

algebra
_______________________________________ MATH133 Unit 1 Individual Project 2 A 1) The following graph shows the depreciation for the corporate airplane from 2006 to 2009. The plane was purchased new in 2006; therefore, x = 0 represents the year 2006. X – axis (horizontal...
Monday, October 10, 2011 at 1:07am

math 117
1. Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to maintain proper formatting. 1. The ...
Sunday, October 9, 2011 at 10:36pm

Math
I dont know how to solve this math problem? A call center is 120 yd. long and 40 yd. wide. Each employee requires 30 sq. ft. if the center needs to have 40% of open space, how many employees can be seated in the center?
Sunday, October 9, 2011 at 4:02pm

Physics
Light is incident on a glass-air interface from the glass side (n=1.5), and researchers want to use the evanescent field on the air side (n=1.0) to excite the molecules adhered to the surface. It is desired that the evanescent field extend a distance δ = 2 µm into ...
Sunday, October 9, 2011 at 3:40pm

physics
space rocket travelling at 20 ms-1 accelerates at 5ms-2 for 2 seconds. how far does the rocket travel during these two seconds?
Sunday, October 9, 2011 at 3:07pm

math
Ture or false questions: Your teacher gives a true-false pop quiz with 10 questions. Show that the number of possible outcomes for the sample space of possible sequences of 10 answers is 1024. I got false and the number is 182 but dont think I have the right number. Some help me.
Sunday, October 9, 2011 at 12:58pm

chemical
The vapor pressure of mercury at 77¢K is 0.0018 mmHg. The atomic weight of mercury is 200.6 g/mole. If the mercury vapor were allowed to reach equilibrium at this temperature in an enclosed space, what would be the mercury vapor concentration in the space?
Saturday, October 8, 2011 at 1:45pm

College Physics
Electronics and inhabitants of the International Space Station generate a significant amount of thermal energy that the station must get rid of. The only way that the station can exhaust thermal energy is by radiation, which it does using thin, 2.2 m-by-4.1 m panels that have ...
Saturday, October 8, 2011 at 3:17am

Physics
To create artificial gravity, the space station shown in the drawing is rotating at a rate of 0.600 rpm. The radii of the cylindrically shaped chambers have the ratio rA/rB = 3.00. Each chamber A simulates an acceleration due to gravity of 5.10 m/s2. Find values for (a) rA, (b...
Friday, October 7, 2011 at 9:39pm

Physics
In a location in outer space far from all other objects, a nucleus whose mass is 3.57232e-25 kg and which is initially at rest undergoes spontaneous "alpha" decay. The original nucleus disappears, and two new particles appear: a He-4 nucleus of mass 6.640678e-27 kg (...
Friday, October 7, 2011 at 10:57am

Math
(Mix and Match) Instructions: choose an item from (a), (b), (c), (d) or (e) that best matches the given problem. Enter your response in the space provided. (a) single equivalent discount (b) amount of discount (c) 3 / 10 , n / 30 (d) 5 / 10 , 3 / 15 , n / 30 e.o.m. (e) R.O.G...
Thursday, October 6, 2011 at 10:53pm

english- writing
1.In a two page double-space essay, using APA formatting, please respond to the following blog conversation that took place last year on a popular sports fan website. Cite 2 references that support your opinions. When people sit around and have discussions about others many ...
Saturday, October 1, 2011 at 11:18am

COM 156
I"m writing a essay for class and this is the rough draft can you please read and let me know what kind of changes I need to make to it. Have you given any thought to where you will live when you are "on your own" - out in the world earning a living? You will ...
Friday, September 30, 2011 at 2:02pm

algebra
Four marbles are drawn at random from a bag containing 7 black marbles and 10 red marbles. Determine the number of outcomes in the sample space of this experiment if the marbles are drawn without replacement.
Wednesday, September 28, 2011 at 11:46pm

ivcc
What is the magnitude of the apparent weight of a 76 astronaut 3200 from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.6 ?
Wednesday, September 28, 2011 at 9:58pm

physics
The Earth’s radius is about 6380 km. The space shuttle is orbiting about 300.1 km above Earth’s surface. If the average speed of the space shuttle is 25700 km/h, find the time required for it to circle Earth. Answer in units of h
Wednesday, September 28, 2011 at 8:40pm

Math 124
There are several ways you might think you could enter numbers in WebAssign, that would not be interpreted as numbers. N.B. There may be hints in RED!!! You cannot have commas in numbers. You cannot have a space in a number. You cannot substitute the letter O for zero or the ...
Wednesday, September 28, 2011 at 5:20pm

earth space science grade 11
what is Microbiologist ? I have to name 4 things that tell me what it is
Monday, September 26, 2011 at 9:20pm

english
I need help with a nonverbal communication types: For example, for (1)the American Sign language...I need to give examples of workplace and lifestyle. (2) Proxemics-the languge of space;example of workplace and lifestyle.Please tell me a ways to write these two so, that I can ...
Monday, September 26, 2011 at 2:56am

College Algebra
Let h(12) = -100 for some function h(x), defined everywhere. If the average rate of change of h(x) from x = 12 to x = 20 is 50, then find h(20). Type your numerical response in the space provided. Do not type in any of the processes which you utilized to arrive at your response.
Monday, September 26, 2011 at 12:08am

physics please help!!
One of the methods used to train astronauts for the effects of "zero gravity" in space is to put them in a specially equipped plane which has been stripped of seats and fitted with padded walls. The pilot then takes the plane up to an altitude of typically 8700 ...
Sunday, September 25, 2011 at 10:56pm

math
A garbage can is in the shape of a rectangular prism. The area of the base of the garbage can is 480 square inches. The height of the garbage can is 30 inches. (Part A) how many cubic inches of space are inside this garbage can? (Part B) Explain how you know your answer is ...
Sunday, September 25, 2011 at 10:13pm

science
Is volume the amount of space an object takes up?
Sunday, September 25, 2011 at 11:42am

diffirential calculus
two points are moving horizontally in space at different heights above the earth. show that the angle of elevation of the line joining them is greater when the distance between them is least.
Sunday, September 25, 2011 at 12:23am

Earth/Space Science
What effect, if any, would you expect a massive forest fire to have on the amount of carbon dioxide in the atmosphere? Explain your answer, please?
Saturday, September 24, 2011 at 5:55pm

math
On a board game if you landed on red you move ahead 1 space,land on blue you move ahead 2 spaces,and land on orange you move back 1 space. If you took 30 spins where would you expect to land relative to where you started?
Thursday, September 22, 2011 at 11:35pm

Physics
A projectile is fired from the origin with an initial velocity V₁=100m/s at an angle θ₁=30⁰. Another is fired from a point on the x-axis at a distance x₀=60m from the origin with initial velocity V₂=80m/s at an angle of θ₂. It is ...
Thursday, September 22, 2011 at 9:39pm

English
Can you check my answers. Label the simple subject(SS) and simple predicate(SP) 1. The artists had less wall space to paint on. artists=SS had=SP 2. Soon beautifully colored stained glass filled the windows. glass=SS filled=SP
Thursday, September 22, 2011 at 7:27pm

chemistry
If the density of an element is 6 g/ml, how much space (in milliliters) should a sample of it displace if it has a mass of 2.4 grams?
Thursday, September 22, 2011 at 3:56pm

physics
Any object that moves through the air (or space) under the influence of gravity is...?
Thursday, September 22, 2011 at 10:29am

Animal Skeletal and Muscular Systems
1.) The development of an animal follows which of the following growth sequences? a. cells, organs, tissues, organ systems b. cells, tissues, organs, organ systems c. cells, organ systems, tissues, organs, d. tissues, cells, organs, organ systems 2.) During an operation, a ...
Wednesday, September 21, 2011 at 11:36pm

cultural diversity
1. National Association for the Education of Young Children supports "third space" thinking as a desirable technique for use in: A. Stimulating children's right-brain processes. B. Enhance staff performance in the early childhood setting. C. Resolving conflicts, ...
Wednesday, September 21, 2011 at 10:01pm

geomatry
is the amount of space between two points on a line it is always expressed as a non-negative number
Monday, September 19, 2011 at 8:38pm

Physics
A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? b. To sell her plan to the ...
Monday, September 19, 2011 at 5:14pm

physics
A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? To sell her plan to the ...
Monday, September 19, 2011 at 4:26pm

Politics
I'm writing a speech, and it's about the topic "Private sector investment is preferable to public sector investment for Human Space Exploration" I'm on the con side for this argument, and one of my reasons was that public sector will spur cooperation, ...
Sunday, September 18, 2011 at 6:30pm

trig
A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.
Saturday, September 17, 2011 at 9:19pm

physics
A car comes to a stop for a stop sign in 4.6 seconds. If it was initially traveling at 27.5 m/s, how much space did it take for the car to stop?
Saturday, September 17, 2011 at 12:22pm

science-electromagnetism
At a particular instant in the,in a region of space where E=0 and B=3i Wbm^-1 , a 2 kg particle of charge 1 C moves with a velocity of 2ims^-1.What is the particle's acceleration due to magnetic field?
Saturday, September 17, 2011 at 8:26am

earth and space
the grams on the moon is different then space ?
Wednesday, September 14, 2011 at 11:30am

Earth/Space Science
Some scientists have hypothesized that meteorites have periodically bombarded Earth and caused mass extinctions every 26 million years. How might this hypothesis be tested?
Tuesday, September 13, 2011 at 9:41pm

Physics
Which of the following is an example of projectile motion? a jet lifting off a runway a thrown baseball an aluminum can dropped straight down into the recycling bin a space shuttle being launched I think it's b, but I'm not sure.
Tuesday, September 13, 2011 at 5:53pm

Science
Why doesn't the space station fall toward the earth, instead of remaining in space? a) It is beyond the earth's gravitational pull. B) The earth's gravity is balanced out by the attraction of the sun and other planets. C) Centrifugal force keeps it up. D) It does ...
Sunday, September 11, 2011 at 8:32pm

Intercultural Communication
what a U.S. manager would need to know about such issues as personal space and rules of social behavior in order to successfully conduct business in China?
Sunday, September 11, 2011 at 7:17pm

Studying Cultures
what a U.S. manager would need to know about such issues as personal space and rules of social behavior in order to successfully conduct business in India?
Sunday, September 11, 2011 at 7:11pm

Essay Check
This is an essay about the article called Rambo's of the road, could you please read it and see if I am getting there? It is supposed to be a critique. Note: This is not a spellcheck or proofread, I just want someone to read it and tell me if it is alright and makes sense...
Sunday, September 11, 2011 at 1:04pm

Earth/Space Science
Explain why scientific ideas that have been subject to many tests are still considered theories and not scientific laws.
Saturday, September 10, 2011 at 11:58pm

math
Trying to convert 465 litres of trunk space to inches or sq. feet. Need to know how many suitcases will fit
Saturday, September 10, 2011 at 10:59am

physics
(A)A runner is jogging at a steady 7.7 km/hr. when the runner is 3.9 km. form the finish line, a bird begins flying from the runner to the finish line at 46.2 km/hr (6 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...
Friday, September 9, 2011 at 11:13pm

science
(A)A runner is jogging at a steady 7.7 km/hr. when the runner is 3.9 km. form the finish line, a bird begins flying from the runner to the finish line at 46.2 km/hr (6 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...
Friday, September 9, 2011 at 10:38pm

Math
A square is 10.5 sq ft by 10.5 sq. ft. The tiles used are 1 sq. ft. How many tiles will be used to fill the space?
Friday, September 9, 2011 at 6:07pm

English
Thank you very much. I'm doubtful about the verb choice in these three sentences. Can you please have a look at them? 1) The journalist believes that parents should give their teenagers space to find their own identity by letting them make their own choices and giving them...
Friday, September 9, 2011 at 5:45pm

English
I left out a few sentences on family relationships I'd like you to check. Thank you. I think the word choice an be improved. 1) Teenagers sometimes feel as if they are caught in a No-Man’s-Land (synonym?) between childhood and adulthood. On the one hand, they want to ...
Friday, September 9, 2011 at 10:11am

Physics
When out in space in International Space Station (ISS), Astronauts experience weightlessness. The ISS’s orbit is 354 km (that is 3.54 x 105 m) above the surface of the earth (You can get more educational NASA resources from: The distance separating the center of the earth...
Thursday, September 8, 2011 at 7:34pm

Physics
An austronaut orbits the Earth in the space shuttle, in one complete orbit, is the magnitude of thr displacement the same as the distance traveled?
Thursday, September 8, 2011 at 6:06pm

Physics
When out in space in International Space Station (ISS), Astronauts experience weightlessness. The ISS’s orbit is 354 km (that is 3.54 x 105 m) above the surface of the earth. The distance separating the center of the earth from the center of the ISS is then approximately ...
Thursday, September 8, 2011 at 8:57am

physics
If the average speed of an orbiting space shuttle is 19600 mi/h, determine the time required for it to circle the Earth. Make sure you consider the fact that the shuttle is orbiting about 200 mi above the Earth's surface, and assume that the Earth's radius is 3963 miles
Wednesday, September 7, 2011 at 11:10pm

Physics
Suppose a space capsule with an astronaut inside is launched from the top of a tower at some angle above the horizontal. a)While the capsule is in free fall, what are the acceleration of the astronaut and the capsule? b)If the astronaut measures his acceleration compared with ...
Tuesday, September 6, 2011 at 8:24pm

English
I urgently need to check this summary of a newspaper article. As I don’t know much of economy, I’d like you to check the use of words. Thank you very much. 1) Chinese economical and political influence is rising in Europe. Examples of its growth are the ownership of ...
Tuesday, September 6, 2011 at 1:14pm

Microbiology
Which of the following statements about the outer membrane of Gram-negative cell wall is FALSE? A. The outside leaflet is largely composed of lipopolysaccharides. B. The outer membrane contains porins that allow passage of molecules and ions directly into the periplasmic space...
Sunday, September 4, 2011 at 10:06pm

Velocity and Displacement
The Space Shuttle travels at a speed of about 7.60 103 m/s. The blink of an astronaut's eye lasts about 120 ms. How many football fields (length = 91.4 m) does the Shuttle cover in the blink of an eye?
Thursday, September 1, 2011 at 4:25pm

homework
ranslate the following situation into an inequality. Do not solve. “Charlie would like to pack one less outfit than Jane for their trip. Loretta would like to bring five outfits less than twice what Jane packs. Due to space in the suitcase, they are limited to a total of ...
Tuesday, August 30, 2011 at 11:01pm

math
paint express charge $30 per gallon of paint plus $1.10 per square foot of wall space. color creations charges $24 per gallon of paint plus $1.20 per square foot of wall space. robert estimates he will need four gallons of paint for the rooms he'd like painted. how much ...
Tuesday, August 30, 2011 at 4:56pm

Chemistryy
Identify the observations of Ernest Rutherford's experiment with the gold foil. Where he experimented on alpha particles and deflection. Check all that apply.... 1) a positive charge is spread equally over the atom 2) THE MAJORity of the space inside the atom is empty ...
Monday, August 29, 2011 at 12:14am

science
Newton’s law of gravity is used with great success in most everyday situations, and indeed, in planning planetary space missions such as the Rosetta probe. However, Einstein’s theory of general relativity and a theory of quantum gravity are needed to describe the ...
Sunday, August 28, 2011 at 12:03pm

space
If the diameter of a galaxy is 243.3 kpc, how many meters is that?
Tuesday, August 23, 2011 at 3:44pm

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