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Astronomy

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astronomy
what good has astronomy produced?

astronomy
Two stars in a binary system are determined from their position on the H-R diagram and the mass-luminiosity relation to have a combined mass of 8 M. Their orbital period, P, is 1 year. What is their orbital seperation, a? http://en.wikibooks.org/wiki/Astronomy/Mass

Astronomy
Few question about astronomy: 1.how many centimetres is equivalent to a light-nanosecond 2. How long is an astronomical unit (AU) in light-minutes (1min, i.e., the distance that light travels in a vacuum in one minute)? Please show the calculation if there is any Thanks

astronomy
what are the contributions of astronomy?

astronomy
what is the meaning of astronomy?

Astronomy
Need some help with Astronomy. I need to figure out the acceleration of gravity on the surface of certain planets. For example, I need to find the acceleration of gravity on Mars when the mass is .11 times the mass of Earth and the radius is .53 times the radius of Earth. ...

astronomy
Even though I do not believe the Big Bang is what created the universe(although what people clam the bing bang was would have been similar to what happened when God said "Let there be light" I still have astronomy hw. haha. I am having trouble with this question. The big bang ...

science
I have to find out some facts about the dwarf planet vulcan. I have tried wikipedia but it was no help. Can any one please give me some facts or websites that can. This may be what you need. http://www.space.com/scienceastronomy/astronomy/epsilon_vulcan_000804.html

astronomy
Why is the sky blue?

Astronomy
What is the radius of the sun?

Astronomy
The saros cycle

Astronomy
What is the phenomenon of differentiation and how does it occurs

Astronomy
Why are there different types of galaxies?

astronomy
How long is the precession cycle?

Astronomy
What type of spectrum is sunlight?

Astronomy
The precession of the Earth its causes, and its ramifications

astronomy
What does supernova produce, helium or carbon?

astronomy
What does supernova produce, helium or carbon?

Astronomy
What is the Lorentz factor for a spaceship traveling at 0.5c?

Astronomy
what are the largest stars in the HR diagram called?

astronomy
big bang theory define

Astronomy
How to find the orbital radius of a planet?

astronomy
which of the statment about CMB are true?

Astronomy HELP
when does a full moon rise and set?

Astronomy
F = GM1M2/R2 = (6.67x10-11 x 1.9891x1030 x 25) / (3000)2 =

astronomy
why does Venus have such a high Albedo

astronomy
on which planets would you weih more than on the earth?

Astronomy
Venus orbits 0.72 AU from the sun. What is that distance in kilometers?

Astronomy
Venus orbits 0.72 AU from the sun. What is that distance in kilometers?

Astronomy
Explain what occurs during tidal friction?

Astronomy
How many degrees of longitude does the Sun move in each hour?

ASTRONOMY
Compare Einstein and Newton's pictures of gravity.

AStrONomY
What contributions of Uranus were made by the Voyager 2 program?

Astronomy
The frequency of a radio transmitter is 90 megahertz. What is its wavelength?

Astronomy
Why is it possible to see Mercury at 6:45 pm on February 5, 2014?

Astronomy
How far will Venus be from Earth on February 19, 2014?

astronomy
If the planet is in an edge-on orbit, what would its mass be (in kg)?

astronomy
Mars currently has a liquid convecting core.

Astronomy
Describe in one sentence the rotations and revolutions of the planets.

Astronomy
If the elipse were a planet's orbit where would the sun be on the page?

astronomy
on which planets would you weigh nearly the same as on earth?

Astronomy
what is the size of Venus? What is this asking? Volume, Mass, or diameter? please help.

Astronomy
what is the size of Venus? What is this asking? Volume, Mass, or diameter? please help.

astronomy
How are cepheid and rr lyrae variables used in determining distances?

astronomy
Explain the cause of the Earths' season. I need a diagram for my explanation

U of M astronomy
if a planet has a period of 1 century, what is its average distance from the Sun in AU?

astronomy
What is the electromagnetic flux coming from the surface of a 5000K blackbody?

astronomy
Why the Universe ,as we know it,made of matter,with no antimatter,and what is the role of neutrino? Thanks

Astronomy
Why is it possible to see the planet Mercury at 6:45 pm on February 5, 2014.

Astronomy
What five object were found in the sky on February 5, 2014 at 9 pm.

Astronomy
Why is the portion of Venus opposite the direction of the Sun not apparent.

Astronomy
Why is the portion of the Moon opposite the direction of the Sun not apparent?

Astronomy
How do astronomers know whether they are seeing planets or stars when they are distant?

astronomy
Astronomers can use the color of an object in space to determine its

Astronomy
How did the voyager mission change our preconception of Jupiter and its moons

astronomy
why is it necessary for ultrviolet telescopes to be placed on a space-based platform? thanks

Astronomy
What are two pieces of evidence that the earth is a highly differentiated body

Math/Science/Astronomy
What is the formula to calculate the illumination fraction of the Moon?

Astronomy
Does the = sign in the equation E=mc2 mean that energy and light are equivalent

Astronomy
Do people wear seatbelts to protect themselves from speed or acceleration?

astronomy
please help. what tools do astronomers use for investigations and give an example.

chemistry
Which of the following is not an example of a science? geology astronomy astrology ecology

chemistry
Which of the following is not an example of a science? geology astronomy astrology ecology

Astronomy
If I was born on August 12, 1953 what is the constellation of my Astrological"Sun Sign".

Astronomy
What is my Astrological "Sun Sign" and how was it determine if I was born on August 12, 1953.

ASTRONOMY
Good evening all, I am working on a PowerPoint presentation for my Astronomy class about planet Earth - my question is: What is Earth's brightest apparent magnitude (if it has one)? I have searched every reliable source I know of (and that I come across), but I cannot seem to ...

Astronomy
Why is the time at which leo transits the meridian different for mexico city and chicago?

Astronomy
Is the ellipse more circular when the tacks are closer together or farther apart?

Astronomy
Is the elipse more circular when the tacks are closer together or farther apart?

Astronomy
How do observations of he sun's surface tell us about conditions in the solar interior?

College astronomy
What would be the parallax of Alpha Centauri if measurements were made from Mars?

english
Christina and Christopher worked together and completed a project about astronomy.

Astronomy 1010
What are six regions of the electromagnetic spectrum? please detail and answer

lang
A science that looks at atmosphere and the weather. A. Chemistry B. Meteorology C. Geology D. Astronomy d

Opinion
Which class would be better(easier) to take Earth Science or Astronomy?

Astronomy
If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?

Astronomy
If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?

astronomy
What phase is the Moon if it is visible in the sky at midnight, but not exactly, opposite the Sun?

Astronomy
How were the different objects in the solar system discovered? What are the properties of the ice giants?

Astronomy
What is the estimated total lifetime for a star with mass 0.7 Msun ? (in billions of year)

Astronomy
True or False? Galaxies are distributed randomly and approximately uniformly in space.

Astronomy
What about a for a supernova in an elliptical galaxy of 10^12 solar masses and radius of 50 kpc? Yes or No

astronomy
What is the semi-major axis of an object that is in 2:1 mean motion resonance with Earth

Astronomy
If you lived on Mars, which of the planets would exhibit retrograde motion? Explain.

astronomy
if you shoot a cannonball due north from a latitude of -45o where will it fall 100km from the cannon

astronomy
what is the speed of a point on the equator in miles per hour as the earth rotates on its axis?

Astronomy
Enter the expression for kinetic energy ( ) below. Use m_1 for mass and v for velocity.

Astronomy
Enter the expression for kinetic energy ( ) below. Use m_1 for mass and v for velocity.

Astronomy
The majory of galaxies (by number) are: - barred spirals - giant ellipticals - lenticulars - dwarfs

Astronomy
Calculate the amount of energy released if a total of 1.5 kg of hydrogen is fused into helium.

Astronomy
How close to the sun Ganymede would have to be in order to hold water in its atmosphere. (in AU)

Astronomy
How much does the luminosity of a spherical source of blackbody radiation increase if you triple its size?

science
can u explain the wter cycle for me ? i wonder what precipitation means? http://www.onelook.com/ Type precipation in that window http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Watercycle.shtml

astronomy/physics
determine the mass of the earth from the known period (365.25 days) and the distance of the moon (3.84X10^3 km)

Science: Astronomy
Why do extremely cold stars look fainter than we might expect from their luminosities and distances?

Science: Astronomy
How many 0.75 -M main sequence stars would it take to equal the luminosity of one 15 -M star?

Astronomy and Space
Using a telescope, which planets acn be observed from Earth in a crescent moon phase?

astronomy
Fill in the blank: The Earth may have gained its water and volatile gases from collisions with _______ .

English
Identify the complete adjective clause and the word it modifies. I elected to take astronomy, which is not a required course.

astronomy
the radius of earth is 4000 miles, how far would you travel in going around the equator?

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