the universe is expanding, but what is it expanding into ?
2006-10-07 08:00:41 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
There is no discrete boundary between the Earth's atmosphere and space as the atmosphere gradually attenuates with increasing altitude. If the atmosphere had a constant temperature, its pressure would decrease exponentially from a sea-level value of 100 kPa (1 bar) toward its final value of zero. The Federation Aeronautique Internationale has established the Kármán line at an altitude of 100 km (62 miles) as a working definition for the boundary between atmosphere and space. The United States designates people who travel above an altitude of 50 miles (80 km) as astronauts. During re-entry, 400,000 feet (75 miles or 120 km) marks the boundary where atmospheric drag becomes noticeable.
2006-10-07 08:09:30 · answer #1 · answered by Spock 6 · 1⤊ 0⤋
You don't have to go up at all to orbit. You only have to go fast enough. It's just easier to go that fast above the atmosphere since there's no air to slow you down.
If you built a vacuum tube a hundred feet beneath the ground that went all the way around the Earth, you could actually orbit underground.
And space itself is a part of the universe. Anywhere not in the universe is still a matter for speculation. Ask again in a few hundred years.
2006-10-07 19:00:06 · answer #2 · answered by Nomadd 7 · 0⤊ 0⤋
Low Eath orbit sattelites are about 100 miles up. Geostationary orbit satelites are 22,000 miles up.
"space" officially starts at some point below 100 miles. Can't remember exactly what height though.
2006-10-07 15:10:01 · answer #3 · answered by amania_r 7 · 1⤊ 0⤋
About 100miles.
2006-10-07 16:12:45 · answer #4 · answered by Torath A 2 · 0⤊ 0⤋
go research in google
2006-10-07 17:12:02 · answer #5 · answered by ej 1 · 0⤊ 0⤋