You may have heard that space is a vacuum and wondered , “ so why does n’t it absorb us off the Earth , like a robot vacuum cleaner sucks dirt off my rug ? ” The answer proceed back to how the cosmos got begin , and how the Earth come to be . Now that Roborock hassentitsS8 MaxV Ultrainto distance , they ’re partnering with Mental Floss to break down the resolution to this grown question .
DefiningVacuum
Before we get into it , though , let ’s talk about what a vacuum is and is n’t . A vacuity is n’t really athing — it ’s more the absence of anything at all . So when someone says “ blank space is a vacuum , ” what they really mean is that it ’s pretty much empty . If you waved a bottle around on a spacewalk and seal it tight , there in all likelihood would n’t be a single atom inside of it .
Your automaton vacuity maintain a region of empty space , too , but it ’s unlike from the vacuum of space : The detritus and hair are swept into the vacuity by differences in press get by suction .
A Packed Beginning
blank was n’t always empty . For the first 400,000 years after the big bang , every inch of the universe was packed with a dense , twiddle soup of stuff — mostly H . All these tightly - packed molecule bounced off one another incessantly , keeping the soup incredibly blistering at first . But as time went on , space expanded , stretching the soup thinner ( like what might bechance if you spill real soup across a table ) . The thinned - out soup also cooled down and began to jell .
Thanks to gravitational attraction , matter does n’t wish to rest spread out ; eventually , everything clumps . The first little clumps of matter forge by stark accident — some patches of blank happened to turn back a bit more stuff than others . And since all matter has gravity , the more stuff there is in a temporary hookup , the more it tugs everything else toward it . Across aeon , these pool of matter pull together more matter . Eventually , some clumps progress to a critical flock , and their puff became so vivid that they quickly collapsed into stars . The junk they left behind then formed the planets that orbit them . The near absolute emptiness of space was left in the areas between .
Gravity take shape the “ clumps ” we live in , but it ’s also what celebrate things on Earth from flying off into space . The vacuum of space does exert a pull on the gas in our atmosphere . But just like you may pull your fingerbreadth out of a vacancy ’s hosiery with a bit of force , the force of gravitation is able to keep the air in our standard atmosphere from getting sucked out into distance .
Cabin Pressure
When you ’re watching a sci - fi picture show and a hole gets bodge in the side of a spaceship , everything start getting sucked out . That ’s because the pressure inside the ship is high-pitched than the very low pressure level of space , so there ’s nothing hold it in to agitate the pull of the vacuum . All matter gravitates , but a ship does n’t dwell of enough subject to force gas in — it take something as bad as the Earth .
Space is n’t actuallycompletelyempty . If you waved around a big trash dish or else of a tiny bottle , you might catch a few atom of hydrogen that managed to turn tail the gravitational drag of all the stars and planets . And just like the obtusely pile gas of the other world was passing spicy , the hydrogen left in space is so loosely packed that it ’s freezing cold .
The vacuum of blank space is also why it ’s mum . Sound is just vibration , and without any airwave corpuscle to shake , audio ca n’t travel .
Now , the next time someone bring up the “ stale emptiness of distance , ” you could explain how it got to be such an uninviting station .
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