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David Hammen
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231 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
30
What will the PRECISE time of the Summer Solstice 2020 be?
Jun 20 at 19:23
29
Why can't our Sun be a binary with Jupiter as a T or Y dwarf?
Jun 5 '16 at 20:36
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
27
Why does the Earth have a z-component at the start of the J2000 epoch?
Jul 14 '19 at 16:47
23
Why does the Parker Solar Probe slow down as the distance from the Sun increases?
May 22 at 1:17
22
Is there any planet/star bigger than VY Canis Majoris?
Jan 20 '15 at 20:13
21
How did the Earth come to be in orbit around the sun?
Jun 6 '16 at 9:58
21
Why can't we see distant galaxies with the naked eye?
Jan 15 '15 at 13:48
20
Why are there no terrestrial planets with a subsurface ocean?
Jun 24 at 1:06
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
19
Why doesn't the sun pull the moon away from earth?
Jun 9 '15 at 13:02
18
How can we avoid needing a leap year/second?
Sep 17 '15 at 18:13
16
Does Sun have a reflection on Earth?
Jun 20 '15 at 9:19
16
How can 'HD 140283' be older than the universe?
Dec 19 '16 at 12:00
16
Are there more stars than all the words ever spoken by humans?
Feb 18 '15 at 22:04
15
Is there any practical use for astronomy?
Apr 1 '15 at 22:49
15
Why doesn't Earth's axis change during the year?
Jan 3 '15 at 9:42
14
Is Pluto a “proto-planet”?
Jun 24 '15 at 14:39
13
What is Charon's ascending node in reference to?
Jan 27 at 13:00
13
Are Tharsis Montes and Hellas Basin a result of the same event?
Jan 17 at 12:41
13
What is this bright “glow” in the center of galaxies?
Jun 29 '17 at 2:28
12
Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth?
May 23 at 12:40
12
Explain to a 4-year old why people below the equator are not tilted or suspended upside down
Jan 7 '18 at 18:24
12
Why is there no hurricane on the Sun?
Nov 7 '17 at 14:22
12
How can we hear the sound of the Sun?
Jan 9 '16 at 17:24
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