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user30007
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22 votes
2 answers
5k views

Do we know a star that is similar to the Sun when it would be a red giant?

20 votes
2 answers
2k views

Was the Sun's gravitational lensing observed in other solar eclipses than the one in 1919?

17 votes
2 answers
4k views

Why don't they make an image of the black hole in the M33 galaxy?

14 votes
3 answers
5k views

Are there any planets or moons denser than Earth?

10 votes
1 answer
361 views

How strong are the strongest Ioquakes?

5 votes
1 answer
304 views

Could Eris have a permanent atmosphere?

5 votes
1 answer
2k views

What does the Sun look like from Eris at its aphelion?

4 votes
1 answer
239 views

Can white dwarfs have accretion discs too?

2 votes
1 answer
170 views

Can the WISE telescope detect black holes?

2 votes
1 answer
378 views

At what distance does Proxima Centauri become visible to the naked eye?

2 votes
1 answer
304 views

How to calculate the true length of day on a celestial body?

1 vote
2 answers
111 views

Should only spherical satellites be considered 'moons'? [closed]

1 vote
1 answer
436 views

How does the surface gravity on Mars vary between the equator and its poles?

1 vote
1 answer
165 views

How fast does a spacecraft have to be to enter a primordial black hole without being torn apart?

1 vote
1 answer
172 views

Are there celestial bodies that are about as far away as the Sun?

1 vote
1 answer
197 views

What happens with the black hole's mass when a black hole disappears?

1 vote
2 answers
188 views

Which celestial body's length of day is closest to that of Earth?

0 votes
0 answers
164 views

Could the Sun's planetary nebula be dangerous for the planets?

0 votes
1 answer
113 views

How is the Sun tilted to its orbit around the Milky Way's center?

0 votes
1 answer
126 views

At what gravity does a body's gravitational lensing become observable?

-1 votes
1 answer
190 views

If the hypothetical planet beyond the Kuiper belt exists, is it likely there are even more planets farther outside?

-8 votes
2 answers
881 views

Why isn't Eris considered a planet despite being the body of dominant mass?