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pela
  • Member for 7 years, 4 months
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104 votes

Simple check for the global shape of the Earth

75 votes
Accepted

What is the speed of sound in space?

64 votes
Accepted

Why does moving through time not require energy?

55 votes

Why is the detection of gravitational waves so significant?

51 votes
Accepted

Can anything be seen from the center of the Boötes void? How dark would it be?

32 votes

How to calculate how many photons are in the universe?

30 votes

Why can't I see the blue color scattered by the lower atmosphere of the earth?

29 votes
Accepted

Does the number density of photons $n_\gamma\approx 10^8 \:\mathrm m^{-3}$ refer to CMB photons only?

24 votes

Drying clothes with the sun's heat, without any air

23 votes
Accepted

How did the universe shift from "dark matter dominated" to "dark energy dominated"?

20 votes
Accepted

What happens to a body, initially at 300K, kept in isolated space? Will it's temperature drop to 0k?

12 votes

Why do cosmic rays slow down when passing through the CMB?

10 votes
Accepted

What paper can I cite for the estimated number of atoms in the observable universe to be lower than $10^{82}$?

10 votes
Accepted

Results of WMAP mission

10 votes
Accepted

Where is all the Dark Matter? Theoretical Question

9 votes
Accepted

Is there a delay between force and acceleration?

9 votes
Accepted

How bright was the universe after Big Bang during photon epoch?

9 votes
Accepted

Is the observable universe equivalent to 'our' light cone?

9 votes
Accepted

How can a photon of a particular energy be supplied to a sample of gas to excite the electrons?

9 votes

How can IR cameras see things colder than the camera?

8 votes

Is the light from the Sun the same as the light from a bulb?

8 votes
Accepted

Why the CMB has not been dispersed so far?

8 votes
Accepted

Do stray photons become interstellar daggers to a space traveler near the speed of light?

8 votes
Accepted

What is my real weight?

7 votes
Accepted

Why can we see the earth from outer space if the sky is blue?

7 votes
Accepted

Why don't objects radiate off all of their heat energy?

7 votes

What is the difference between mean free path and intermolecular distance?

7 votes

Understanding the units of number density

7 votes
Accepted

Are galaxies really structured the way they look in pictures?

7 votes

Will the CMB ever stop shining?

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