Did any one ever prove that space is a complete vaccum?
2006-11-21 01:38:16 · 4 answers · asked by goring 6 in Science & Mathematics ➔ Physics
Hi. Space is not a complete vacuum. There are a number of hydrogen atoms throughout. A few per cubic meter. But if you think about it, light can reach us through billions of light years of space, so it is a very good vacuum if not a perfect one. And any material should SLOW the light. 'c' is still the fastest speed.
2006-11-21 01:43:55 · answer #1 · answered by Cirric 7 · 1⤊ 0⤋
Hi!
There isn't indeed a mention about c being a limit speed.
The first postulate says that the speed of light is c for any referential. Even if the referential is another light ray! (weird! I know.) If you try to find some mathematical equations to describe the relation between two such referentials you will observe that the relative speed between them cannot be greater that c.
2006-11-21 01:57:25 · answer #2 · answered by viktorpopescu 2 · 0⤊ 0⤋
look,...there is acceleration(change in speed) only when there is an external force present (newton's 1st law)...as electromagnetic waves dont have an external force on them,...they dont change their speed. however,...certain factors like density of the medium might change the speed(this is called refraction).
hence the speed of light is constant in vacuo.
and no space is not a complete vacuum(consists of very far placed hydrogen atoms) ,,,still for all practical purposes it is quite a vacuum
2006-11-21 02:06:53 · answer #3 · answered by catty 4 · 0⤊ 1⤋
No.
2006-11-21 04:14:06 · answer #4 · answered by Ramsees II- the Great One 5 · 0⤊ 1⤋