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When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today? (Intermediate)
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Jan 08 |
80834 |
|
How long would it take the Earth to fall into the Sun? (Intermediate)
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Jul 05 |
175215 |
|
Have astronomers observed any phenomena that could be produced by extraterrestrial civilizations? (Intermediate)
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May 05 |
69427 |
|
Why are accretion disks flat? (Intermediate)
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Apr 05 |
79351 |
|
How do we know that nuclear fusion is still going on in the Sun? (Intermediate)
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Jan 05 |
109644 |
|
Is the universe really like an expanding balloon? (Intermediate)
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Jan 05 |
110534 |
|
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths? (Intermediate)
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Dec 04 |
226371 |
|
How can we understand the meaning of large numbers like "a million million?" (Beginner)
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Nov 04 |
62223 |
|
Would extraterrestrial civilizations know that there is life on Earth? (Beginner)
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Oct 03 |
68407 |
|
Will the Moon be invisible in 500 million years? (Beginner)
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Oct 03 |
92869 |
|
What is apparent magnitude? (Intermediate)
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Sep 03 |
155779 |
|
Is the universe expanding faster than the speed of light? (Intermediate)
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Sep 03 |
583092 |
|
How do we define distance in an expanding universe? (Intermediate)
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Aug 03 |
121373 |
|
When the Sun converts mass to energy, do the orbits of the planets change? (Advanced)
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Aug 03 |
154891 |
|
What is the observational difference between a star and a planet? (Beginner)
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Jul 03 |
348179 |
|
How long do supernova remnants last? (Intermediate)
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May 03 |
73385 |
|
What is the universe expanding into? (Intermediate)
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Apr 03 |
763529 |
|
How can we see galaxies if their stars are so faint? (Intermediate)
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Feb 03 |
71309 |
|
Does gravity vary across the surface of the Earth? (Intermediate)
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Feb 03 |
373024 |
|
What process would bring about a quark star? (Intermediate)
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Jan 03 |
67128 |
|
Could there be life in the galaxies nearest to the Milky Way? (Intermediate)
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Jan 03 |
166920 |
|
Does evolution contradict the second law of thermodynamics? (Intermediate)
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Jan 03 |
250412 |
|
How does the brightness of a star depend on its distance from us? (Beginner)
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Dec 02 |
128997 |
|
How do astronauts communicate with their families from space? (Beginner)
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Dec 02 |
105948 |
|
Can you see the future as you fall into a black hole? (Intermediate)
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Dec 02 |
157570 |
|
How can we see the Milky Way if we are inside it? (Intermediate)
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Dec 02 |
498572 |
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When we look back to the Big Bang, why don't we see the universe as a tiny speck of matter? (Intermediate)
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Dec 02 |
88092 |
|
Why do astronauts in space need to exercise? (Beginner)
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Nov 02 |
70306 |
|
Why doesn't the length of each day change much around the solstices? (Intermediate)
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Nov 02 |
118105 |
|
Do we see the same stars from above and below the equator? (Beginner)
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Nov 02 |
198674 |
|
Why isn't the sky bright at night if the universe has so many stars? (Intermediate)
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Nov 02 |
267304 |
|
What are "blue stragglers" in globular clusters? (Intermediate)
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Nov 02 |
92766 |
|
How do you calculate the lifetime of the Sun? (Advanced)
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Nov 02 |
234289 |
|
How long does a solar eclipse last? (Beginner)
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Oct 02 |
193602 |
|
What companies or businesses can astronomers work for? (Beginner)
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Oct 02 |
97681 |
|
Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (Advanced)
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Oct 02 |
61420 |
|
What is the farthest in space that we have gone? (Beginner)
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Oct 02 |
174215 |
|
How close does a supernova need to be to damage the Earth's environment? (Intermediate)
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Sep 02 |
74824 |
|
Is light of different colors affected differently by gravity? (Intermediate)
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May 02 |
68642 |
|
Why do clocks turn in the opposite direction from the Earth and Moon? (Intermediate)
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Apr 02 |
134951 |
|
Do most astronomers believe in God based on the available scientific evidence? (Beginner)
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Mar 02 |
181078 |
|
What can we learn from the color of a star? (Intermediate)
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Mar 02 |
246611 |
|
What happens to a substance if its speed is more than the speed of light? (Intermediate)
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Mar 02 |
198071 |
|
Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (Intermediate)
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Feb 02 |
122375 |
|
Could there have been multiple Big Bangs at different places in the universe? (Intermediate)
|
Feb 02 |
96971 |
|
What is the difference between the "Doppler" redshift and the "gravitational" or "cosmological" redshift? (Advanced)
|
Feb 02 |
141867 |
|
How do astronauts use math in their jobs? (Beginner)
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Feb 02 |
118316 |
|
How does astronomy benefit humankind? (Beginner)
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Dec 01 |
161531 |
|
What is the physical difference between a star and a planet? (Intermediate)
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Sep 01 |
461899 |
|
Could dark energy come from matter anti-matter pairs forming spontaneously and then annihilating? (Advanced)
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Aug 01 |
68253 |
|
Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background? (Advanced)
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Aug 01 |
58338 |
|
What does the term "visible universe" mean? (Beginner)
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Jul 01 |
75062 |
|
How do astronomers use math in their jobs? (Beginner)
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May 01 |
228609 |
|
What is the density of a black hole? (Advanced)
|
Apr 01 |
183711 |
|
Why is the moon in a different place every night? (Beginner)
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Apr 01 |
373762 |
|
What happened to all the black holes that were around in the early universe? (Intermediate)
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Mar 01 |
63554 |
|
Why do some eclipses take longer than others? (Intermediate)
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Jan 01 |
77668 |
|
What is a star's "spectrum"? (Beginner)
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Oct 00 |
125268 |
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How can we distinguish a star's "real" color from the change in color that we observe due to the star's motion? (Intermediate)
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Oct 00 |
83012 |