Questions tagged [vacuum]

Questions about the properties of vacuums or perfect vacuums

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3answers
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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 ...
-2
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1answer
91 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?
5
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0answers
46 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 ...
-2
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5answers
740 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 ...
5
votes
0answers
142 views

Who was the first to realize that the Earth is surrounded by vacuum? [closed]

My question isn't about the arrangement of planets in space (geocentrism / heliocentrism), nor the understanding of the whole universe (we are in a galaxy, there are galaxies etc). My question is: who ...
0
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0answers
139 views

Would a magnetic charge over the Schwinger limit create visual effects in the vacuum of the solar system?

Say, hypothetically, that you use a variation of the Takeyama electromagnetic coil experiment (https://www.space.com/41950-magnet-physics-doors-tokyo.html) to generate a short lived but very extreme ...
0
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0answers
81 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
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 ...
8
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1answer
1k 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 ...
117
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3answers
15k views

How loud would the Sun be?

Sound can't travel through outer space. But if it could, how loud would the Sun be? Would the sound be dangerous to life on Earth, or would we barely hear it from this distance?