User joseph.hainline - Astronomy Stack Exchange

21 votes

2 answers

3k views

How bright would the sun appear from the hypothetical Planet Nine proposed by Caltech?

asked Jan 21, 2016 at 6:01

18 votes

2 answers

651 views

How long should it take for us to observationally determine if Caltech's Planet Nine is really there?

asked Jan 20, 2016 at 18:42

13 votes

2 answers

403 views

Are black holes expected to contain the same ratio of dark matter to regular matter as the rest of the universe?

asked Feb 14, 2017 at 2:02

11 votes

2 answers

568 views

What would it feel like to be orbiting near a merging black hole?

asked Sep 27, 2017 at 23:04

10 votes

1 answer

1k views

What would the sun look like from aphelion of The Goblin's orbit?

asked Dec 18, 2018 at 14:46

8 votes

2 answers

4k views

Size of Saturn's ring material

asked Sep 19, 2016 at 22:30

7 votes

2 answers

795 views

Could the merger of two rotating black holes create another that breaks the rotational speed limit?

asked Sep 19, 2016 at 1:46

7 votes

1 answer

391 views

How much damage would collision with a similar mass primordial black hole do to earth?

asked Oct 10, 2019 at 21:24

6 votes

2 answers

215 views

When are gravitational waves emitted during a merger of black holes?

asked Sep 8, 2016 at 13:43

5 votes

3 answers

677 views

Theoretically what happens to a black hole that evaporates?

asked Apr 5, 2018 at 2:49

4 votes

1 answer

617 views

Is it likely that intergalactic stars would still retain their planets?

asked Mar 13, 2018 at 4:15

4 votes

1 answer

426 views

How bright could Gliese 710 appear in 1.35 million years?

asked Jan 6, 2017 at 3:47

4 votes

2 answers

468 views

Are there good animations of the movement of proximate stars over long time periods?

asked Jan 24, 2016 at 18:17

4 votes

0 answers

87 views

Why does the outside edge of a Kerr black hole ergosphere rotate at the same speed as the inner edge?

asked Sep 13, 2019 at 4:04

2 votes

2 answers

333 views

How much of the earth would remain intact if the sun expanded into a red giant encompassing its orbit?

asked Feb 12, 2022 at 15:11

2 votes

3 answers

9k views

How much of the Milky Way is visible to the naked eye from earth?

asked Mar 25, 2015 at 1:34

2 votes

1 answer

693 views

Orbital period for a 1 light year object?

asked Oct 21, 2016 at 15:17

1 vote

1 answer

954 views

Could information be transmitted from inside a black hole using gravitational waves?

asked Sep 8, 2016 at 13:57

1 vote

1 answer

4k views

What's the theoretical maximum density of a galaxy?

asked Aug 30, 2016 at 18:22

1 vote

1 answer

179 views

Is there any legitimacy to this report of planet nine being discovered by an amateur?

asked Aug 2, 2017 at 20:49

0 votes

1 answer

154 views

What would the view be list from TRAPPIST-1g, looking back towards TRAPPIST-1? [duplicate]

asked Mar 1, 2017 at 3:47

Stack Exchange Network

21 Questions

How bright would the sun appear from the hypothetical Planet Nine proposed by Caltech?

How long should it take for us to observationally determine if Caltech's Planet Nine is really there?

Are black holes expected to contain the same ratio of dark matter to regular matter as the rest of the universe?

What would it feel like to be orbiting near a merging black hole?

What would the sun look like from aphelion of The Goblin's orbit?

Size of Saturn's ring material

Could the merger of two rotating black holes create another that breaks the rotational speed limit?

How much damage would collision with a similar mass primordial black hole do to earth?

When are gravitational waves emitted during a merger of black holes?

Theoretically what happens to a black hole that evaporates?

Is it likely that intergalactic stars would still retain their planets?

How bright could Gliese 710 appear in 1.35 million years?

Are there good animations of the movement of proximate stars over long time periods?

Why does the outside edge of a Kerr black hole ergosphere rotate at the same speed as the inner edge?

How much of the earth would remain intact if the sun expanded into a red giant encompassing its orbit?

How much of the Milky Way is visible to the naked eye from earth?

Orbital period for a 1 light year object?

Could information be transmitted from inside a black hole using gravitational waves?

What's the theoretical maximum density of a galaxy?

Is there any legitimacy to this report of planet nine being discovered by an amateur?

What would the view be list from TRAPPIST-1g, looking back towards TRAPPIST-1? [duplicate]