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Astronomy
Page 7
Questions (9,715)
Does the = sign in the equation E=mc2 mean
that energy and light are equivalent
1 answer
asked by
b
353 views
Compared with the strength of Earth's gravity at its surface, how much weaker is gravity at a distance of 13 Earth radii from
1 answer
asked by
Anonymous
418 views
When the Sun ends up as a white dwarf, billions of years from now, it will contain about 40 percent of its present-day mass and
4 answers
asked by
Leilani
405 views
Why are there different types of galaxies?
1 answer
asked by
Magesh
416 views
Do people wear seatbelts to protect themselves from speed or acceleration?
1 answer
asked by
Dre
299 views
If the giant blue star R136a1 has the diameter 35 times our sun, how many times bigger is it? example: our sun is 1.3 million
1 answer
asked by
Ed West
391 views
In the equation 4pi^2/G/p^2 times a^3, what is the value of 4pi^2? Is it 39.47? or 157.913
1 answer
asked by
Rebecca
312 views
Suppose the Sun were twice as massive as it actually is. What would be the orbital period of a planet at a distance of 10AU from
1 answer
asked by
SW
414 views
How many degrees of longitude does the Sun move in each hour?
1 answer
asked by
James
305 views
Explain how you could determine, given the following 3 pieces of information, (you need all 3 together not each one
1 answer
asked by
James
406 views
Calculate the wavelength of peak emission for a typical sunspot and compare it to that of the photosphere. How many times
1 answer
asked by
Kaitlyn
380 views
What is the Lorentz factor for a spaceship traveling at 0.5c?
3 answers
asked by
Linda
282 views
The maximum wavelength of emission from Neptune's cloud tops is 6.0 x 10-5m. Using this value, determine the temperature of
4 answers
asked by
Kaitlyn
392 views
you are 100,000 feet above planet B and the ground range to your horizon point is 400 miles. What is the radius of planet B?
1 answer
asked by
Anonymous
402 views
You've been told the Earth puts out 0.070 [W/m squared] as a global average. What would you predict would be the surface heat
1 answer
asked by
Jeremy
356 views
If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
1 answer
asked by
Leila
401 views
Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in
1 answer
asked by
Leila
300 views
If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
1 answer
asked by
Leila
441 views
If the Milky Way and the Andromeda galaxies are approximately 2 million light years apart and are moving toward each other at
1 answer
asked by
Jobeth
376 views
Consider an object that emits thermal radiation at a peak wavelength of 12.2 nm. What is the temperature of this object?
1 answer
asked by
Ryan
301 views
Give at least two pieces of evidence in the Preview chapter that contradict the belief that the universe is less than 10,000
1 answer
asked by
Cathy
362 views
If M is the mass of one body and m is the mass of another body, and their separation is d, then the gravitational force between
1 answer
asked by
Haley
352 views
A polar satellite, in a low Earth orbit passing over both poles, makes 16 orbits each day. Viewed from Earth, how far apart in
1 answer
asked by
Scarlett
321 views
Purpose the run somehow becomes a black hole without change in its mass , it will pull into itself
a.all the planets b.only
1 answer
asked by
Ajai
386 views
What is the radius of the sun?
1 answer
asked by
jane
445 views
What is the maximum altitude above the horizon at which it is possible to find the moon when you are observing from a position
1 answer
asked by
jane
319 views
Enter the expression for kinetic energy ( ) below. Use m_1 for mass and v for velocity.
1 answer
asked by
LaV ern
303 views
Enter the expression for kinetic energy ( ) below. Use m_1 for mass and v for velocity.
1 answer
asked by
LaV ern
286 views
How to find the orbital radius of a planet?
1 answer
asked by
Jola
314 views
The volume of a ball is given in terms of its radius by V=4π3R3. Use this to find the average density of Saturn, i.e. the mass
1 answer
asked by
sam
373 views
Suppose the Moon is at a (center-to-center) distance D from Earth. Find an exact expression for the magnitude of the tidal force
1 answer
asked by
sam
429 views
The majory of galaxies (by number) are:
- barred spirals - giant ellipticals - lenticulars - dwarfs
1 answer
asked by
qwerty
295 views
Which of the following can be considered evidence of galaxy evolution observed in the Milky Way?
- differential rotation of the
1 answer
asked by
qwerty
423 views
Mergers of two supermassive black holes will be major sources for observations of gravitational waves in the future. What do
1 answer
asked by
qwerty
376 views
If a comet was at aphelion (furthest distance from the sun) in 1944 and will be at perihelion (closest point to the sun) in
1 answer
asked by
Rico
375 views
If a comet was at aphelion (furthest distance from the sun) in 1944 and will be at perihelion (closest point to the sun) in
1 answer
asked by
Rico
352 views
For this question assume the moon is 110 of its diameter away from the Earth.
The largest apparent size of Mercury that we ever
1 answer
asked by
Elisabeth
382 views
What is the size, i.e. the radius, of a black hole with a mass equal to that of Earth (MEarth=6×1024kg)? Give your answer to
1 answer
asked by
qwerty
319 views
Look up where Voyager 1 is now and compute how many lighthours it is away.
Round your answer to the nearest number of light
1 answer
asked by
qwerty
321 views
Which of the below statements about the CMB are true?
(i) The “hot” and “cold” spots are areas where photons have
1 answer
asked by
qwerty
441 views
What were the relative energy densities in the early Universe? (below, DE means dark energy)
(a) They remain roughly equal: �rad
1 answer
asked by
qwerty
339 views
The Universe is filled with a frozen in Higgs condensate. If this were to suddenly disappear/evaporate, what would happen?
(a)
1 answer
asked by
qwerty
408 views
What percentage of the energy budget do electrons occupy? Take the energy budget occupied by matter to be 4.4%.
(a) 3.9% (b) 0.1%
4 answers
asked by
qwerty
358 views
Basically the ``Bohr radius'' for the dark matter is
rB=ℏ^2 / GN M m^2 where m is the dark matter mass, M is the total amount
1 answer
asked by
qwerty
420 views
Calculate the amount of energy released if a total of 1.5 kg of hydrogen is fused into helium.
1 answer
asked by
Steven
334 views
On the Autumnal Equinox, you see the Moon in the Waxing Crescent Phase at an angle of 45 degrees above the western horizon. What
1 answer
asked by
Maria
335 views
1. Sun-grazing comet ISON disintegrated on November, 2013. Observation of the comet suggested an elliptical orbit with period
1 answer
asked by
keitanako
425 views
In fact, more precise calculations suggest that ISON was on a hyperbolic, unbound orbit. How much more precise?
Find the minimal
1 answer
asked by
keitanako
336 views
For an object of mass m in a circular orbit of radius R under the gravitational influence of a center of mass M, find an
1 answer
asked by
keitanako
373 views
1. In this collection of problems we will try to use what we have learned to see what information about a hypothetical Solar
3 answers
asked by
keitanako
418 views
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