Linked Questions

0
votes
2answers
359 views

Why should space be empty? [duplicate]

Possible Duplicate: How vacuous is intergalactic space? The emptiness of space is explained in many articles... But, space does contain some matter due to these possible reasons: During the ...
12
votes
10answers
20k views

Does anything exist in the intergalactic space?

I am a part time physics enthusiast and I seldom wonder about the intergalactic space. First, it is my perception that all(almost all) the objects in the universe are organized in the forms of ...
24
votes
2answers
813 views

How do we know that these radio bursts are from billions of light-years away?

NASA just announced that they detected the first radio bursts from outside of our galaxy. Astronomers, including a team member from NASA's Jet Propulsion Laboratory in Pasadena, Calif., have detected ...
9
votes
3answers
774 views

Temperature in space

Temperature is a measure of kinetic energy transferred to particles, henceforth, space being vacuum, temperature cannot be measured. But then, there is cosmic background radiation. It is the leftover ...
3
votes
5answers
2k views

Is there perfect vacuum 10000 billion lightyears away?

Is there perfect vacuum about some 10,000 billion light years away? With perfect vacuum, I mean that there are no particles, not even virtual photons! I had this idea by assuming that all particle ...
2
votes
2answers
3k views

What exactly does vacuum contain?

Does vacuum or outer space contain any gases? Recently i watched a video on youtube,in which NASA installs a camera on a spacecraft.The footage shows some dust particles or some matter floating over ...
6
votes
1answer
523 views

How fast until you feel wind in space? [duplicate]

I couldn't find this question asked anywhere else, so I thought I would ask it here: does anyone know how fast you would have to be traveling in space to feel 'wind' from the particles in front of you?...
2
votes
2answers
246 views

How can the Hubble telescope see the light from galaxies that are millions of light years distant?

The Hubble Space Telescope is in the news every now and then. How can it photograph galaxies that are millions of light years from Earth? We can understand that light comes from galaxy and Hubble "...
2
votes
2answers
345 views

CMB absorption by interstellar medium and contamination with galactic microwave photons

Question edited on 27.06.2018 for clarity The Cosmic Microwave Background (CMB) is often called the radiation leftover from big bang, or more precisely, the photons decoupled from the thermal bath ...
6
votes
1answer
109 views

What would the universe look like if it started out without any irregularities?

(Warning! Newbie question coming up!) Background As seen on this picture of the cosmic microwave background (take from the Wikipedia entry on the very same topic) there exists irregularities in the ...
3
votes
3answers
138 views

What's in my box?

Let's say that I have a box which is 100% empty. I fly into the vacuum of space, open the box and close it after a certain time. Then I go back to earth and my question is.. What's in my box? (...
0
votes
1answer
79 views

Are there other theories than gravitational attraction taken into account as a reason for the extreme accumulation of matter in the universe?

This question is about how small the interstellar density is (less than 1 atom per cubic centimeter). But although the interstellar density is very low, matter tends to extremely aggregate in certain ...
0
votes
1answer
67 views

Will a triboelectrically charged object in vacuum stay charged forever?

So, according to this question's answers: How does an object regains its neutrality after being charged by rubbing? Charge from triboelectrically charged object is removed by ionized moist air and ...