Astrophysics column explains densities from Earth vacuums to intergalactic space
Updated
Updated · Big Think · May 8
Astrophysics column explains densities from Earth vacuums to intergalactic space
3 articles · Updated · Big Think · May 8
It says CERN’s Large Hadron Collider reaches about 10 billionths of a pascal, yet still contains roughly 2.4 trillion atoms per cubic metre.
The piece compares the Moon’s atmosphere, interplanetary space, interstellar gas clouds and protoplanetary disks, where densities range from hundreds of particles to 100 trillion particles per cubic metre.
It concludes the emptiest known regions are cosmic voids, with about 0.1 protons and 0.1 electrons per cubic metre, far sparser than low-Earth orbit.
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