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140 Answers

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103
Simple check for the global shape of the Earth
Oct 15 '18 at 10:53
69
What is the speed of sound in space?
Jan 29 '15 at 12:59
64
Why does moving through time not require energy?
Apr 17 '15 at 9:37
55
Why is the detection of gravitational waves so significant?
Feb 11 '16 at 15:20
50
Can anything be seen from the center of the Boötes void? How dark would it be?
Apr 17 '19 at 16:16
30
Why can't I see the blue color scattered by the lower atmosphere of the earth?
Nov 17 '15 at 13:02
28
How to calculate how many photons are in the universe?
Aug 28 '16 at 18:33
24
Does the number density of photons $n_\gamma\approx 10^8 \:\mathrm m^{-3}$ refer to CMB photons only?
Jul 28 '15 at 9:03
24
Drying clothes with the sun's heat, without any air
Apr 7 '15 at 11:26
23
How did the universe shift from “dark matter dominated” to “dark energy dominated”?
May 23 '16 at 11:56
20
What happens to a body, initially at 300K, kept in isolated space? Will it's temperature drop to 0k?
Mar 31 '15 at 11:29
12
Why do cosmic rays slow down when passing through the CMB?
Jul 4 '17 at 11:53
10
Results of WMAP mission
Oct 1 '18 at 10:11
10
What paper can I cite for the estimated number of atoms in the observable universe to be lower than $10^{82}$?
Apr 1 '17 at 15:15
10
Where is all the Dark Matter? Theoretical Question
Apr 20 '15 at 9:02
9
How can IR cameras see things colder than the camera?
Jul 25 '16 at 6:37
9
Is there a delay between force and acceleration?
May 11 '15 at 8:54
8
What is my real weight?
Feb 4 '16 at 11:31
8
Why the CMB has not been dispersed so far?
Mar 13 '15 at 10:27
7
Are galaxies really structured the way they look in pictures?
Sep 7 '18 at 13:11
7
Understanding the units of number density
Jul 6 '17 at 13:33
7
Is the light from the Sun the same as the light from a bulb?
Mar 10 '17 at 12:16
7
What is the difference between mean free path and intermolecular distance?
Mar 6 '17 at 13:42
7
Do stray photons become interstellar daggers to a space traveler near the speed of light?
Feb 3 '16 at 23:38
6
Will the CMB ever stop shining?
May 7 '18 at 13:53
6
Density distribution of the interstellar medium
Feb 6 '17 at 21:33
6
Time and velocity
Jan 12 '16 at 11:57
6
Why does the pen does not move straight?
Jan 4 '16 at 7:43
6
We say Light is Red-Shifted or Blue-shifted from faraway stars and galaxies
Dec 20 '15 at 15:47
6
Why don't objects radiate off all of their heat energy?
Nov 13 '15 at 10:04
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