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Astronomy
Page 6
Questions (9,987)
Describe in one sentence the rotations and revolutions of the planets.
1 answer
asked by
Liz
317 views
Mercury has an orbital eccentricity of 0.21. Find the perihelion and aphelion distances of Mercury. What is the ratio of
1 answer
asked by
Sue
439 views
What is the phenomenon of differentiation and how does it occurs
1 answer
asked by
Mike
372 views
so i know that theres something Astronomically wrong with this quote but cannot figure out exactly what, would appreciate some
3 answers
asked by
Mike
334 views
Why is the time at which leo transits the meridian different for mexico city and chicago?
3 answers
asked by
Melissa
364 views
If the elipse were a planet's orbit where would the sun be on the page?
1 answer
asked by
joe
445 views
what is the size of Venus?
What is this asking? Volume, Mass, or diameter? please help.
1 answer
asked by
John
369 views
Why is most of the mass of the solary system contained in the Sun?
Briefly describe the protoplanet theory of planet formation.
1 answer
asked by
John
349 views
Why do widths/strengths of spectral lines differ between supergiant stars and main sequence?
Does the density of gases in the
1 answer
asked by
nichola
422 views
I have two stars A = 7150K and B = 4850K.A is 20 times brighter than B.
Assuming L/Lv is the same for both stars find the ratio
1 answer
asked by
nichola
415 views
If stars should always be visible, where should you be located on earth?
Can I answer this considering the celestial sphere and
3 answers
asked by
O_o Rion
384 views
What do the red stars in the galatic milkyway tell us about the history of the milkyway?
1 answer
asked by
Taylor
286 views
What do the red stars in the galatic milkyway tell us about the history of the milkyway?
1 answer
asked by
Taylor
302 views
Does the = sign in the equation E=mc2 mean
that energy and light are equivalent
1 answer
asked by
b
361 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
423 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
410 views
Why are there different types of galaxies?
1 answer
asked by
Magesh
418 views
Do people wear seatbelts to protect themselves from speed or acceleration?
1 answer
asked by
Dre
304 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
392 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
314 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
424 views
How many degrees of longitude does the Sun move in each hour?
1 answer
asked by
James
309 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
411 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
387 views
What is the Lorentz factor for a spaceship traveling at 0.5c?
3 answers
asked by
Linda
283 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
396 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
404 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
360 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
407 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
303 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
448 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
379 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
306 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
367 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
355 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
325 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
391 views
What is the radius of the sun?
1 answer
asked by
jane
460 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
327 views
Enter the expression for kinetic energy ( ) below. Use m_1 for mass and v for velocity.
1 answer
asked by
LaV ern
305 views
Enter the expression for kinetic energy ( ) below. Use m_1 for mass and v for velocity.
1 answer
asked by
LaV ern
288 views
How to find the orbital radius of a planet?
1 answer
asked by
Jola
320 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
375 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
430 views
The majory of galaxies (by number) are:
- barred spirals - giant ellipticals - lenticulars - dwarfs
1 answer
asked by
qwerty
299 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
425 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
380 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
378 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
356 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
383 views
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