Comment on Shine a laser on the moon
Sludgeyy@lemmy.world 2 days agoSpace isn’t really a vacuum
Wait what?
Space is a vacuum.
Could argue it’s not a perfect vacuum. We haven’t created a perfect vacuum on Earth but we have come close.
If I have a container and remove all the air inside. I have created a vacuum. Not a perfect one, but a simple vacuum.
If I add rocks to the container. The rocks are now in a vacuum.
Just like space. Space is a vacuum and there is “rocks” in it.
lath@lemmy.world 2 days ago
Yeah, but it’s not just “rocks” in space, it’s everything. Or what we consider as such.
If you see light from distant stars, doesn’t it mean there’s radiation from there to here? There’s lots of stuff in space, you just don’t see it as noteworthy.
Sludgeyy@lemmy.world 1 day ago
Space 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 1 day 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 1 day 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.