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James K's user avatar
James K's user avatar
James K's user avatar
James K
  • Member for 9 years, 9 months
  • Last seen this week
79 votes
Accepted

The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?

71 votes

Are photons aged?

67 votes

Why did it take so long to invent telescopes given glass was used 4000 years ago in Mesopotamia?

65 votes
Accepted

Shouldn't very very distant objects appear magnified?

62 votes

Why is Starlink polluting the night sky a big concern if we have space telescopes?

61 votes

Do our sun and moon have names?

60 votes
Accepted

Why isn't the asteroid belt affected by Jupiter's gravitational field?

58 votes

How can comets have tails if there's no air resistance in space?

58 votes
Accepted

How did Eratosthenes know that the sun is far away?

58 votes
Accepted

Will there be collision between universes?

56 votes

Is the Big Bang a theory or a model?

54 votes
Accepted

How do scientists know that the distant parts of the universe obey the physical laws exactly as we observe around us?

54 votes
Accepted

Why is there a gap in this image of supernova discoveries?

53 votes
Accepted

Why are the time zones calculated as 360°/24 and not 361°/24 or 360°/23.933?

51 votes

Why is the solstice the first day of summer, and not the central day?

48 votes
Accepted

How did the ancient cultures determine that the year was actually a fraction of an extra day beyond 365 days?

48 votes

How did the Milky Way quasar not disrupt life on Earth?

47 votes

Is the Astronomical Unit measured from the Sun's center or from the surface?

47 votes

If all stars rotate, why was there a theory developed that requires non-rotating stars?

46 votes

What keeps galaxies together?

46 votes

Can a lunar eclipse happen at night and be followed by a solar eclipse the next day?

45 votes
Accepted

Why is there a year 1 B.C., a year 0, and a year 1 A.D. in NASA’s Five Millennium Canon of Solar Eclipses?

45 votes

Why, since Earth is in free fall towards Sun, are tides affected by Sun's gravity? Why aren't the oceans "weightless" like astronauts?

45 votes
Accepted

When stars explode after running out of fuel, why are new stars born from the remnants?

45 votes

Why is the discovery of merging neutron stars important?

44 votes

Why is there a mountain inside the Herschel crater on Mimas?

44 votes

How can a mirror see things that the naked eye can’t?

44 votes
Accepted

Does the Earth constantly lose mass?

44 votes

Is it possible for a lunar eclipse to occur before sunset

44 votes

Why is Uranus called a "green planet"?

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