2007-04-20 06:36:19 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Space is a vacuum because there is no gravity.
The earth has air (pressure) because our gravity holds it there and pulls down on it. The higher you go the thinner the air gets.
Think of it this way, space is the norm, no gravity, no or zero pressure. You need something (gravity) to pull things down or together to create pressure.
The earth has air pressure of about 15 pounds per square inch, you don't feel it because you were born here and feel it as normal.
For more information and maybe better explanations, try looking up "air pressure on earth"
2007-04-20 07:02:34 · answer #1 · answered by gino 3 · 0⤊ 0⤋
A vacuum means there is nothing as a gas out there ,nothing but a few rocks. The vacuum in space is better than the vacuum in the old radio tubes . In fact it is so good NASA doesn't put a glass case around the tube ,it reduces the weight a lot.
2007-04-20 16:19:53 · answer #2 · answered by JOHNNIE B 7 · 0⤊ 0⤋
Vacuum means absence of matter. Space is a vacuum because there is very, very little matter in the universe compared to its volume. Most of the matter is spread very evenly through space - so its not a complete vacuum, but its better than vacuum we can make on Earth. Occassionally matter clumps to form stars, planets etc, but these contain very little matter compared to so called empty space. There is just an aweful lot of space out there.
2007-04-20 13:54:34 · answer #3 · answered by Anonymous · 0⤊ 0⤋
vacuum means no air and nothing. for example take a syringe and close its opening the pull the plunger . u ill Find it difficult to do so because no air is getting in and there is a vacuum created in it.then when u leave the plunger it goes back because of atmospheric pressure.and if u retain its position and open the opening then the air gushes in that is also because of atmospheric pressure.but in space both the things wont happen because there is no air present there. this is called vacuum.
2007-04-20 13:44:26 · answer #4 · answered by gaurav g 1 · 0⤊ 0⤋
It simply means an absence of almost all matter - including air. There are a few molecules, etc floating around, but most have been attracted to bodies such as stars, planets, etc. by their gravitational attraction.
Actually the explosions on the sun send out particles as well as the photons that provide us heat, but they are very widely dispersed by the time they go past us.
2007-04-20 13:54:42 · answer #5 · answered by p v 4 · 0⤊ 0⤋
A vaccuum basically means a space with no air.
So space has no air at all. People sometimes get confused and then think that planets and moons have no air either, but this is not true. It's only space that has no air.
2007-04-20 13:40:01 · answer #6 · answered by don't stop the music ♪ 6 · 1⤊ 0⤋
If taken in whole, the universe actualy is not a vacuum. After all, you have nobel gases and lots of matter in it.
2007-04-20 14:09:51 · answer #7 · answered by russ117044 1 · 0⤊ 0⤋
A vacuum simply means it is void of all matter, gas, liquid, solids...there is NOTHING there.
What caused it? Again, nothing. There would be a cause from SOMETHING to be there, but since there is NOTHING there then you don't have a cause.
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2007-04-20 13:40:18 · answer #8 · answered by non_apologetic_american 4 · 3⤊ 0⤋
It means there's basically no atoms or molecules out there. Gravitation from planets, stars, moons, etc. attracts the molecules and atoms that would be floating and leaves nothing in space.
2007-04-20 13:39:53 · answer #9 · answered by zeb 4 · 2⤊ 0⤋
In response to non_apologetic, I would say that that used to be the thinking - nothing exists out there, but now there is talk of dark matter which really defies common definitions of "matter". So to say that there is nothing out there is not necessarily factually accurate.
2007-04-20 13:45:19 · answer #10 · answered by Rob B 4 · 1⤊ 0⤋