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usernumber
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36 votes
2 answers
6k views

How was the mass of Venus determined?

34 votes
2 answers
6k views

Is oxygen really the most abundant element on the surface of the Moon?

30 votes
1 answer
9k views

How far apart are stars in a binary system?

29 votes
1 answer
3k views

How is Uranus' north pole defined?

28 votes
1 answer
5k views

How is it possible that we haven't discovered anything in the Oort cloud yet?

27 votes
3 answers
3k views

Is it possible to detect gravitational lensing of stars behind the Moon?

27 votes
3 answers
5k views

Why don't the inner moons of Jupiter have tidally-induced volcanism?

25 votes
2 answers
8k views

Is Jupiter still an anomaly?

25 votes
3 answers
9k views

Why do some supermassive black holes have a * in their name?

24 votes
1 answer
2k views

Why does the sensitivity to GWs drops off inversely proportional to the distance?

24 votes
1 answer
2k views

How long between the moment a meteor is first visible and the moment a meteorite hits the ground?

24 votes
3 answers
4k views

Are there lightning bolts on Mars?

23 votes
4 answers
5k views

What's the difference between an exoplanetary transit and eclipse? [duplicate]

23 votes
2 answers
3k views

What ground-based observational evidence is there that the Moon doesn't have an atmosphere?

22 votes
1 answer
3k views

Why was there a gap in the number of asteroid detections between 1807 and 1845?

22 votes
5 answers
4k views

How far away are the events that caused the gravitational waves that have been detected?

22 votes
1 answer
3k views

What would an asteroid inside of Mercury's orbit be called?

21 votes
1 answer
576 views

Can we detect pulsars that aren't "pointed" towards us?

21 votes
3 answers
6k views

How often do Type Ia supernovae occur?

20 votes
1 answer
3k views

What causes fast moving pulsars to move so fast?

20 votes
2 answers
2k views

Is there an upper limit on the mass of black hole mergers we can detect?

20 votes
1 answer
2k views

What is behind the Great Red Spot's longevity?

20 votes
2 answers
2k views

When was the martian dichotomy first observed?

19 votes
3 answers
17k views

During an eclipse, how big is the shadow of the moon on the earth?

17 votes
3 answers
3k views

How often are there lunar eclipses on Jupiter

17 votes
1 answer
3k views

Why does the solar analemma have a strange shape on Jupiter?

16 votes
3 answers
2k views

What is the probability of seeing a neutron star as a pulsar?

16 votes
1 answer
3k views

How can an area be on the day side 90% of the time?

14 votes
2 answers
1k views

Are there Earth rocks on Mars?

14 votes
2 answers
3k views

Why not send a Gaia-like mission to Mars?

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