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David Hammen
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289 Answers

Votes Activity Newest
40
Is it possible that the shadow of The Moon is a single dot during solar eclipse?
Sep 15 '19 at 19:13
36
Why is there so little nitrogen in the Martian and Venusian atmospheres?
Jul 3 '20 at 3:34
31
How was the mass of Venus determined?
Sep 27 '20 at 15:19
31
How is it possible that Saturn's gravitational acceleration felt by Mimas is stronger than Mimas' own surface gravity?
Sep 14 '20 at 16:10
30
How many times brighter would full-earth-shine appear to people standing on the moon, than full-moon-shine does to people on earth?
Feb 8 at 9:07
30
What will the PRECISE time of the Summer Solstice 2020 be?
Jun 20 '20 at 19:23
30
Why can't our Sun be a binary with Jupiter as a T or Y dwarf?
Jun 5 '16 at 20:36
28
Why are the time zones calculated as 360°/24 and not 361°/24 or 360°/23.933?
Sep 26 '20 at 10:59
28
Why does the Earth have a z-component at the start of the J2000 epoch?
Jul 14 '19 at 16:47
28
Will Earth lose the Moon before the Sun goes into supernova?
Nov 20 '14 at 8:50
28
Is the Earth-Sun distance 1.012 AU?
May 18 '16 at 13:26
26
Do our sun and moon have names?
Nov 30 '20 at 14:29
25
What do astronomers do different now that they know about fusion of the Sun?
Mar 24 at 5:41
23
Why does the Parker Solar Probe slow down as the distance from the Sun increases?
May 22 '20 at 1:17
22
Why won't the Sun set for days at N66.2 which is below the arctic circle?
Mar 23 at 1:21
22
Why would the side of the moon that faces earth be as dark as the far side of the moon?
Feb 7 at 10:46
22
How did the Earth come to be in orbit around the sun?
Jun 6 '16 at 9:58
22
Is there any planet/star bigger than VY Canis Majoris?
Jan 20 '15 at 20:13
21
The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?
Jan 30 at 11:14
21
Why are there no terrestrial planets with a subsurface ocean?
Jun 24 '20 at 1:06
21
Why can't we see distant galaxies with the naked eye?
Jan 15 '15 at 13:48
20
Why doesn't the sun pull the moon away from earth?
Jun 9 '15 at 13:02
19
Is it possible that the Sun and all the nearby stars formed from the same nebula?
Feb 11 at 5:03
19
How does the Moon's gravity affect Earth's oceans despite Earth's stronger gravitational pull?
Aug 15 '19 at 15:15
19
Does a star fuse helium to beryllium on the main sequence?
Nov 5 '18 at 22:48
19
Simple experimental evidence that Earth revolves around Sun
Jul 9 '18 at 20:35
19
Why is the Earth-Moon distance not the same at each perigee/apogee?
Jan 24 '18 at 6:17
18
How can we avoid needing a leap year/second?
Sep 17 '15 at 18:13
17
Why don't the inner moons of Jupiter have tidally-induced volcanism?
Jul 20 '20 at 12:32
16
What are “non-Keplerian” orbits? What are some familiar examples in our solar system, and can some still be closed?
Nov 3 '20 at 3:19
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