User ProfRob

235 votes

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If I sliced the universe in half, would the slice go through a star?

answered Feb 26, 2018 at 12:36

199 votes

Seeing something from only one angle means you have only seen (what?)% of its surface area at most?

answered Aug 7, 2017 at 20:00

114 votes

Why aren't there spherical galaxies?

answered Nov 24, 2014 at 7:57

107 votes

Why are protons, rather than electrons, the nucleus in atoms?

answered Sep 20, 2021 at 6:09

93 votes

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Why doesn't the nuclear fusion in a star make it explode?

answered Apr 5, 2020 at 8:51

85 votes

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How can we see planets thousands of light years away but don't know if there are more planets in the solar system?

answered Jan 21, 2016 at 20:54

84 votes

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Why is hydrogen the most abundant element in the Universe?

answered Jul 20, 2018 at 7:50

83 votes

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Why are stars white?

answered Mar 12, 2015 at 19:09

73 votes

Do solar systems typically spin in the same direction as their galaxy?

answered Sep 7, 2015 at 17:39

68 votes

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Why is the Sun almost perfectly spherical?

answered Sep 21, 2015 at 21:59

68 votes

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What is the origin of elements heavier than iron?

answered Oct 13, 2014 at 21:34

62 votes

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Can a gym be built to supply electricity to homes?

answered Jan 17, 2017 at 10:50

61 votes

Can light become a satellite of a black hole?

answered Aug 26 at 12:58

61 votes

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Why is the Cosmic Microwave Background evidence of a hotter, denser early universe?

answered Feb 11, 2020 at 7:53

59 votes

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Why is Andromeda only partially blue-shifted?

answered Aug 19, 2016 at 17:55

58 votes

If you sliced the moon in half perfectly, would it hold together?

answered May 10, 2021 at 6:59

57 votes

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Sun's power density compared to a compost heap

answered Nov 26, 2017 at 11:30

56 votes

If iron can’t undergo fusion, does that mean a black hole is mostly iron?

answered Jun 18, 2018 at 11:15

54 votes

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What would happen if Jupiter collided with the Sun?

answered Apr 27, 2018 at 10:24

52 votes

Why does moonlight have a lower color temperature?

answered Mar 22, 2016 at 14:35

51 votes

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Is our solar system really that odd?

answered May 3, 2021 at 7:46

51 votes

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Can a neutron star become a black hole via cooling?

answered Feb 17, 2017 at 17:49

51 votes

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Why would a black hole explode?

answered Jan 17, 2015 at 17:29

49 votes

Why is the cut off mass for massive stars 8 solar masses? Why can't it be 10-11 solar masses or so?

answered Mar 31, 2016 at 8:01

49 votes

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Why was M87 targeted for the Event Horizon Telescope instead of Sagittarius A*?

answered Apr 10, 2019 at 18:12

47 votes

What exactly is the fireball caused by a nuclear bomb?

answered Aug 5, 2023 at 20:07

46 votes

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Why should the Planck constant be a constant throughout all space?

answered Oct 13, 2015 at 8:45

45 votes

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Free electron can't absorb a photon

answered Dec 23, 2015 at 10:20

45 votes

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Can lasers lift objects?

answered Apr 10, 2016 at 14:39

42 votes

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Why isn't the circumferential light around the M87 black hole's event horizon symmetric?

answered Apr 10, 2019 at 21:37

Stack Exchange Network

2,447 Answers

If I sliced the universe in half, would the slice go through a star?

Seeing something from only one angle means you have only seen (what?)% of its surface area at most?

Why aren't there spherical galaxies?

Why are protons, rather than electrons, the nucleus in atoms?

Why doesn't the nuclear fusion in a star make it explode?

How can we see planets thousands of light years away but don't know if there are more planets in the solar system?

Why is hydrogen the most abundant element in the Universe?

Why are stars white?

Do solar systems typically spin in the same direction as their galaxy?

Why is the Sun almost perfectly spherical?

What is the origin of elements heavier than iron?

Can a gym be built to supply electricity to homes?

Can light become a satellite of a black hole?

Why is the Cosmic Microwave Background evidence of a hotter, denser early universe?

Why is Andromeda only partially blue-shifted?

If you sliced the moon in half perfectly, would it hold together?

Sun's power density compared to a compost heap

If iron can’t undergo fusion, does that mean a black hole is mostly iron?

What would happen if Jupiter collided with the Sun?

Why does moonlight have a lower color temperature?

Is our solar system really that odd?

Can a neutron star become a black hole via cooling?

Why would a black hole explode?

Why is the cut off mass for massive stars 8 solar masses? Why can't it be 10-11 solar masses or so?

Why was M87 targeted for the Event Horizon Telescope instead of Sagittarius A*?

What exactly is the fireball caused by a nuclear bomb?

Why should the Planck constant be a constant throughout all space?

Free electron can't absorb a photon

Can lasers lift objects?

Why isn't the circumferential light around the M87 black hole's event horizon symmetric?