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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 |
60931 |
|
How long would it take the Earth to fall into the Sun? (Intermediate)
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Jul 05 |
141602 |
|
Have astronomers observed any phenomena that could be produced by extraterrestrial civilizations? (Intermediate)
|
May 05 |
53435 |
|
Why are accretion disks flat? (Intermediate)
|
Apr 05 |
60851 |
|
How do we know that nuclear fusion is still going on in the Sun? (Intermediate)
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Jan 05 |
86820 |
|
Is the universe really like an expanding balloon? (Intermediate)
|
Jan 05 |
89611 |
|
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 |
181181 |
|
How can we understand the meaning of large numbers like "a million million?" (Beginner)
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Nov 04 |
47987 |
|
Would extraterrestrial civilizations know that there is life on Earth? (Beginner)
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Oct 03 |
53217 |
|
Will the Moon be invisible in 500 million years? (Beginner)
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Oct 03 |
71287 |
|
What is apparent magnitude? (Intermediate)
|
Sep 03 |
136670 |
|
Is the universe expanding faster than the speed of light? (Intermediate)
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Sep 03 |
516119 |
|
How do we define distance in an expanding universe? (Intermediate)
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Aug 03 |
97072 |
|
When the Sun converts mass to energy, do the orbits of the planets change? (Advanced)
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Aug 03 |
126798 |
|
What is the observational difference between a star and a planet? (Beginner)
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Jul 03 |
309117 |
|
How long do supernova remnants last? (Intermediate)
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May 03 |
56816 |
|
What is the universe expanding into? (Intermediate)
|
Apr 03 |
640364 |
|
How can we see galaxies if their stars are so faint? (Intermediate)
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Feb 03 |
56676 |
|
Does gravity vary across the surface of the Earth? (Intermediate)
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Feb 03 |
296946 |
|
What process would bring about a quark star? (Intermediate)
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Jan 03 |
52870 |
|
Could there be life in the galaxies nearest to the Milky Way? (Intermediate)
|
Jan 03 |
144820 |
|
Does evolution contradict the second law of thermodynamics? (Intermediate)
|
Jan 03 |
220680 |
|
How does the brightness of a star depend on its distance from us? (Beginner)
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Dec 02 |
99305 |
|
How do astronauts communicate with their families from space? (Beginner)
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Dec 02 |
86414 |
|
Can you see the future as you fall into a black hole? (Intermediate)
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Dec 02 |
124379 |
|
How can we see the Milky Way if we are inside it? (Intermediate)
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Dec 02 |
398911 |
|
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 |
72503 |
|
Why do astronauts in space need to exercise? (Beginner)
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Nov 02 |
57628 |
|
Why doesn't the length of each day change much around the solstices? (Intermediate)
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Nov 02 |
99606 |
|
Do we see the same stars from above and below the equator? (Beginner)
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Nov 02 |
147143 |
|
Why isn't the sky bright at night if the universe has so many stars? (Intermediate)
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Nov 02 |
240490 |
|
What are "blue stragglers" in globular clusters? (Intermediate)
|
Nov 02 |
76441 |
|
How do you calculate the lifetime of the Sun? (Advanced)
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Nov 02 |
189647 |
|
How long does a solar eclipse last? (Beginner)
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Oct 02 |
173695 |
|
What companies or businesses can astronomers work for? (Beginner)
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Oct 02 |
80022 |
|
Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (Advanced)
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Oct 02 |
48578 |
|
What is the farthest in space that we have gone? (Beginner)
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Oct 02 |
148935 |
|
How close does a supernova need to be to damage the Earth's environment? (Intermediate)
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Sep 02 |
57335 |
|
Is light of different colors affected differently by gravity? (Intermediate)
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May 02 |
51432 |
|
Why do clocks turn in the opposite direction from the Earth and Moon? (Intermediate)
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Apr 02 |
100694 |
|
Do most astronomers believe in God based on the available scientific evidence? (Beginner)
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Mar 02 |
142594 |
|
What can we learn from the color of a star? (Intermediate)
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Mar 02 |
201265 |
|
What happens to a substance if its speed is more than the speed of light? (Intermediate)
|
Mar 02 |
160943 |
|
Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (Intermediate)
|
Feb 02 |
102108 |
|
Could there have been multiple Big Bangs at different places in the universe? (Intermediate)
|
Feb 02 |
76232 |
|
What is the difference between the "Doppler" redshift and the "gravitational" or "cosmological" redshift? (Advanced)
|
Feb 02 |
109866 |
|
How do astronauts use math in their jobs? (Beginner)
|
Feb 02 |
100822 |
|
How does astronomy benefit humankind? (Beginner)
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Dec 01 |
136475 |
|
What is the physical difference between a star and a planet? (Intermediate)
|
Sep 01 |
417318 |
|
Could dark energy come from matter anti-matter pairs forming spontaneously and then annihilating? (Advanced)
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Aug 01 |
52573 |
|
Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background? (Advanced)
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Aug 01 |
45434 |
|
What does the term "visible universe" mean? (Beginner)
|
Jul 01 |
59472 |
|
How do astronomers use math in their jobs? (Beginner)
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May 01 |
187483 |
|
What is the density of a black hole? (Advanced)
|
Apr 01 |
156059 |
|
Why is the moon in a different place every night? (Beginner)
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Apr 01 |
260685 |
|
What happened to all the black holes that were around in the early universe? (Intermediate)
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Mar 01 |
50504 |
|
Why do some eclipses take longer than others? (Intermediate)
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Jan 01 |
57824 |
|
What is a star's "spectrum"? (Beginner)
|
Oct 00 |
104253 |
|
How can we distinguish a star's "real" color from the change in color that we observe due to the star's motion? (Intermediate)
|
Oct 00 |
65715 |