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ahiijny
  • Member for 6 years, 1 month
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  • Earth
89 votes
2 answers
12k views

Why is the discovery of merging neutron stars important?

  • 923
77 votes
2 answers
16k views

Could the dinosaurs have seen the asteroid that killed them?

  • 875
71 votes
4 answers
9k views

How does the Earth move in the sky as seen from the Moon?

  • 1,509
70 votes
5 answers
15k views

Why not take a picture of a closer black hole?

  • 683
70 votes
2 answers
10k views

Can gravitational waves pass through a black hole?

  • 753
65 votes
3 answers
18k views

If a massive object like Jupiter flew past the Earth how close would it need to come to pull people off of the surface?

50 votes
4 answers
11k views

Why does it take so long to transmit an image from New Horizons to Earth?

  • 717
47 votes
3 answers
13k views

If Earth is tilted, why is Polaris always above the same spot?

  • 369
46 votes
3 answers
12k views

Why is Mars cold?

41 votes
5 answers
3k views

How are black holes found?

  • 4,853
39 votes
3 answers
3k views

Do moons have moons?

  • 6,087
35 votes
1 answer
7k views

Considering our methods of exploration, how likely is it that there are unfound planets (not dwarf planets) in our solar system?

  • 695
34 votes
3 answers
6k views

Can Pluto be seen with the naked eye from Neptune when Pluto and Neptune are closest?

32 votes
2 answers
5k views

Is there any known moon of a moon? [duplicate]

29 votes
5 answers
8k views

Is it possible to mount a telescope on a plane? Is it beneficial?

27 votes
2 answers
4k views

Are we really star-stuff from the interior of collapsing stars?

  • 30.6k
27 votes
2 answers
8k views

Why didn't the Event Horizon Telescope team mention Sagittarius A*?

25 votes
4 answers
4k views

Are there any double stars that I can actually see orbit each other?

  • 30.6k
25 votes
7 answers
12k views

If the Moon were impacted by a suitably sized meteor, how long would it take to impact the Earth?

  • 394
24 votes
1 answer
5k views

What's the reason that we have a different number of days each month?

22 votes
3 answers
6k views

Help understanding this unsettling image of Titan, Epimetheus, and Saturn's rings?

  • 30.6k
21 votes
4 answers
9k views

Would an object shot from earth fall into the sun?

  • 321
20 votes
1 answer
3k views

Why can't supermassive black holes merge? (or can they?)

  • 30.6k
19 votes
2 answers
3k views

Why does the Earth have a z-component at the start of the J2000 epoch?

18 votes
4 answers
3k views

Are there any to-scale diagrams of the TRAPPIST-1 system?

  • 288
17 votes
4 answers
6k views

Official degrees of earth’s rotation per day

17 votes
3 answers
6k views

In which direction is the sun travelling?

  • 293
15 votes
6 answers
2k views

How "fast" do astronomical events occur?

15 votes
5 answers
6k views

Will there be collision between universes?

  • 169
14 votes
1 answer
1k views

How long after the Big Bang would CMB radiation have been between 273 and 373 K?