Comment on Shine a laser on the moon
Sludgeyy@lemmy.world 2 days agoSpace is a vacuum, the other stuff just makes it not a perfect vacuum as a whole.
When you say “space” it is talking about the nothingness.
If you put something in the space it is no longer space but the object you put there
So like the whole outer space isn’t a perfect vacuum. But the parts where it is empty are, the space.
lath@lemmy.world 2 days ago
But space isn’t really space because there’s always something in, but we consider it as nothing so we can see space as space.
benderbeerman@lemmy.world 2 days ago
Vacuum does not only infer an area devoid of matter… it’s also considered a vacuum if it has substantially lower pressure than earth’s atmosphere at sea level.
lath@lemmy.world 2 days ago
Hold up. Isn’t space under a lot of pressure to expand, only it’s directed outwards, so we ain’t just feeling it?
FooBarrington@lemmy.world 2 days ago
No, we don’t yet know why space is expanding. But space has way way waaaaay lower pressure than the earth atmosphere since it’s almost empty. It even keeps sucking away bits of our atmosphere.