Questions tagged [vacuum]

Questions about the properties of vacuums or perfect vacuums

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9
votes
1answer
2k views

How can we hear the sound of the Sun?

Recently NASA has revealed that they have recorded the sound of Sun. They say that it produces a sound like "Om". I can't understand how they can hear it. To the best of my knowledge, sound can't ...
7
votes
0answers
118 views

Water vapour in space

This question is inspired by, but different from, What happens if an ice cube is left in space? Mark's accepted answer says "…if you stick your ice cube out in the Oort Cloud, it'll grow: the mean ...
3
votes
2answers
351 views

Why does radiation not need a medium to travel?

I wanted to know how radiation moves in vacuum of space and why it doesn't need any medium ? ( Like sunlight reaching a planet )
1
vote
1answer
49 views

Could vacuum energy dim standard candles?

It is assumed that particles and anti-particles pop out in vacuum (vacuum energy). Could this have an effect on the paths of photons when they interact with these particles? The amount of photons ...
1
vote
1answer
290 views

What would happen if you jumped out of a moving spacecraft? [closed]

I've watched a film where one of the characters claimed to have rapidly disembarked a moving spacecraft during a 5g burn (?!) and immediately wondered how he survived. For example, you're on a ...
0
votes
0answers
82 views

Does space not make sound, or can we just not hear it? [duplicate]

This is a question regarding sound waves and space. I know that sound waves must travel through a medium "air", enter our brains, and then we can decipher what exactly the sound is. But in space, ...
-1
votes
5answers
1k views

Vacuum of space [closed]

Firstly I’m genuinely interesting in a working explanation for this question. It is for this reason that I am editing the question to fine tune the question. In essense the question has remained the ...
-1
votes
1answer
75 views

is there any excuse or reason why our bubble in Hawking's space-time foam theory is retained? [closed]

Hawking said that universes are like bubbles that pop into existence and pop back into the vacuum some form then immediately pop, he calls this space-time foam, our bubble doesn't seem to pop ...
-2
votes
1answer
102 views

How Essential is the Vacuum Energy to Our Present Model of the Expanding Universe? [closed]

How essential to modern cosmology is the vacuum energy concept, and what would happen to our model of the expanding universe if it were proved to be non-existent?
-4
votes
3answers
220 views

How do we know that vacuum is devoid of matter?

According to Wikipedia:- Vacuum is a state with no matter particles (hence the name), and no photons. I don't understand how can we find a part of space where there is no matter present?How is it ...