User David Hammen

52 votes

Accepted

Is the sun's volume shrinking currently?

the-sun mass

answered May 28, 2021 at 10:33

47 votes

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Why is the summer solstice night shorter than the winter solstice day?

answered Jun 12 at 12:37

41 votes

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What is the most accurate measurement of the Astronomical Unit?

astronomical-unit education

answered Oct 17, 2021 at 18:29

40 votes

Is it possible that the shadow of The Moon is a single dot during solar eclipse?

the-moon solar-eclipse

answered Sep 15, 2019 at 19:13

36 votes

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Why is there so little nitrogen in the Martian and Venusian atmospheres?

planet planetary-formation planetary-science planetary-atmosphere

answered Jul 3, 2020 at 3:34

34 votes

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How can Io be tidally heated while it is in tidal lock?

solar-system celestial-mechanics tidal-forces tidal-locking io

answered Dec 1, 2021 at 15:39

32 votes

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How was the mass of Venus determined?

observational-astronomy history mass venus

answered Sep 27, 2020 at 15:19

32 votes

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Will Earth lose the Moon before the Sun goes into supernova?

the-moon the-sun gravity earth supernova

answered Nov 20, 2014 at 8:50

31 votes

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How is it possible that Saturn's gravitational acceleration felt by Mimas is stronger than Mimas' own surface gravity?

gravity saturn

answered Sep 14, 2020 at 16:10

31 votes

Is it a coincidence that on the far side of the moon almost no seas are visible?

the-moon

answered Jun 8, 2021 at 23:31

31 votes

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Why are asteroids so much richer in precious metals than Earth's crust?

asteroids

answered Jun 9 at 19:57

30 votes

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How many times brighter would full-earth-shine appear to people standing on the moon, than full-moon-shine does to people on earth?

the-moon albedo

answered Feb 8, 2021 at 9:07

30 votes

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What will the PRECISE time of the Summer Solstice 2020 be?

solstice

answered Jun 20, 2020 at 19:23

30 votes

Why can't our Sun be a binary with Jupiter as a T or Y dwarf?

jupiter binary-star brown-dwarf

answered Jun 5, 2016 at 20:36

29 votes

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Am I miscalculating distance to Moon?

distances

answered Mar 17 at 12:58

28 votes

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

orbit nasa ephemeris

answered Jul 14, 2019 at 16:47

28 votes

Do our sun and moon have names?

the-sun the-moon terminology

answered Nov 30, 2020 at 14:29

28 votes

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

earth time

answered Sep 26, 2020 at 10:59

28 votes

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Is the Earth-Sun distance 1.012 AU?

units

answered May 18, 2016 at 13:26

27 votes

Why do sunspot rise in number "precisely" every eleven years?

the-sun magnetic-field sunspots

answered Jun 20, 2021 at 15:28

25 votes

What do astronomers do different now that they know about fusion of the Sun?

the-sun

answered Mar 24, 2021 at 5:41

23 votes

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Why does the Parker Solar Probe slow down as the distance from the Sun increases?

orbital-mechanics space-probe parker-solar-probe

answered May 22, 2020 at 1:17

23 votes

Is there any planet/star bigger than VY Canis Majoris?

star

answered Jan 20, 2015 at 20:13

22 votes

Accepted

Why would the side of the moon that faces earth be as dark as the far side of the moon?

the-moon albedo

answered Feb 7, 2021 at 10:46

22 votes

Why won't the Sun set for days at N66.2 which is below the arctic circle?

solar-system python celestial-mechanics ephemeris

answered Mar 23, 2021 at 1:21

22 votes

Why there are no terrestrial planets with a subsurface ocean?

exoplanet tidal-forces astrobiology

answered Jun 24, 2020 at 1:06

22 votes

Accepted

How do Lagrange points L2 and L3 form?

lagrange-point

answered Oct 17, 2021 at 21:26

22 votes

Why doesn't the sun pull the moon away from earth?

the-sun orbit the-moon gravity earth

answered Jun 9, 2015 at 13:02

22 votes

How did the Earth come to be in orbit around the sun?

solar-system earth planetary-formation

answered Jun 6, 2016 at 9:58

21 votes

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

orbit the-moon

answered Jan 30, 2021 at 11:14

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354 Answers

Is the sun's volume shrinking currently?

Why is the summer solstice night shorter than the winter solstice day?

What is the most accurate measurement of the Astronomical Unit?

Is it possible that the shadow of The Moon is a single dot during solar eclipse?

Why is there so little nitrogen in the Martian and Venusian atmospheres?

How can Io be tidally heated while it is in tidal lock?

How was the mass of Venus determined?

Will Earth lose the Moon before the Sun goes into supernova?

How is it possible that Saturn's gravitational acceleration felt by Mimas is stronger than Mimas' own surface gravity?

Is it a coincidence that on the far side of the moon almost no seas are visible?

Why are asteroids so much richer in precious metals than Earth's crust?

How many times brighter would full-earth-shine appear to people standing on the moon, than full-moon-shine does to people on earth?

What will the PRECISE time of the Summer Solstice 2020 be?

Why can't our Sun be a binary with Jupiter as a T or Y dwarf?

Am I miscalculating distance to Moon?

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

Do our sun and moon have names?

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

Is the Earth-Sun distance 1.012 AU?

Why do sunspot rise in number "precisely" every eleven years?

What do astronomers do different now that they know about fusion of the Sun?

Why does the Parker Solar Probe slow down as the distance from the Sun increases?

Is there any planet/star bigger than VY Canis Majoris?

Why would the side of the moon that faces earth be as dark as the far side of the moon?

Why won't the Sun set for days at N66.2 which is below the arctic circle?

Why there are no terrestrial planets with a subsurface ocean?

How do Lagrange points L2 and L3 form?

Why doesn't the sun pull the moon away from earth?

How did the Earth come to be in orbit around the sun?

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