Asked by: Clarine Atamanyuk
asked in category: General Last Updated: 29th May, 2020

What causes the vacuum in space?

The vacuum of outer space is not caused by the expansion of the universe, but is caused by gravity. There would still be things like vacuum fluctuations, gravity, and dark matter, which can't be sucked out. With that said, outer space is very close to empty compared to earth's atmosphere.

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Furthermore, how much vacuum is in space?

The best man-made vacuum so far, Extreme Ultra-high Vacuum, ≈ 10Torr, corresponds roughly to a density of ≈ 3×10particles per cubic meter. The average density of the entire Universe (as calculated by WMAP/NASA), is said to be ≈ 9.9×10kg/m, equivalent to ≈ 5.9 particles (protons) per cubic meter.

One may also ask, how do we know space is a vacuum? We can tell that most of the Universe is a vacuum because matter absorbs and scatters light. We can accurately measure the amount of material between us and stars, and that gives an average density of gas in the Galaxy of only one atom per cubic centimeter. That's a better vacuum than we can achieve in a laboratory.

Considering this, what creates a vacuum?

Vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. A vacuum can be created by removing air from a space using a vacuum pump or by reducing the pressure using a fast flow of fluid, as in Bernoulli's principle.

What does space smell like?

When astronauts return from space walks and remove their helmets, they are welcomed back with a peculiar smell. An odor that is distinct and weird: something, astronauts have described it, like "seared steak." And also: "hot metal." And also: "welding fumes." Space, Jones elaborated, smells a little like gunpowder.

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