how far away is space from earth?

Question

from sea level

Answer 1

there is no space between Earth and Space.

Answer 2

How Far Away Is Space

Answer 3

Most people consider space to simply be the region above the Earth's atmosphere. But, there is no tangible boundary because the atmosphere gradually thins with increasing altitude. Traces of the gasses we breathe can be found over 100 miles above the earth.

As a comparison, passenger jets cruise at an average altitude of only 30,000 feet (5.7 miles), and the best military jets have a hard time climbing above 100,000 feet (a little less than 19 miles).

So, how do we define where space begins? Many different definitions exist. The United States awards astronaut status to anyone who flies above 50 miles in altitude. Many flight engineers, dealing with the effects of friction and heating of spacecraft due to atmospheric particles, define the boundary to be at 400,000 feet (75.76 miles). They call this the "entry interface," the point at which heating on reentry becomes observable.

Whichever definition you prefer, it is far, far above the level that humans can breathe.

Answer 4

This is a funny way of asking the question, as space is all around us making it hard to answer. I assume you mean, how high the atmosphere goes, which is at least possible to answer:

We live at the bottom of an ocean of air, but while the watery ocean has a well defined top surface, the atmosphere just dwindles away.

As most of us realize, at sea level the atmosphere exerts a certain pressure--about 1 kilogram per square cm, or about 15 pounds per square inch. It comes from the weight of the air piled up on top of us. Atop a mountain 5 kilometers high, half the atmosphere is below you, so the weight on top is only half as much, and the pressure and density are also only half of what they are as at sea level. (The value given as 5 km is approximate and also depends on temperature.) Another 5 kilometers, half as much again--that is 1/4 the pressure and density of sea level. And so forth.

At this rate, 20 such halvings bring us to 100 kilometers and a millionth of the density, (actually it's about twice that). Air still contains 12 million million molecules in each cubic centimeter, but up to this height, its composition has remained about the same--78% nitrogen, 21% oxygen, nearly 1% of argon, some 0.1% carbon dioxide and other gases. From here on, however, collisions between molecules are less frequent, and different gases tend to settle at different rates, the ones with heavier molecules at the bottom, with a smaller "halving distance." Both oxygen and nitrogen form molecules of two atoms, but oxygen molecules tend to get split up into separate atoms, and these (being lighter than the molecules) extend further up. Nitrogen dominates to 200 kilometers, but then up to 600 kilometers it's atomic oxygen, and after that--would you believe helium? Down at the ground its concentration is insignificant, but being lightest, it outlasts the others. Still higher, the main component is hydrogen, even lighter than helium.

By then, the density is so low that atoms and molecules rarely collide, they just rise above the atmosphere like tossed stones, then fall back. But even at 600 kilometers some atmosphere remains--ultra-violet photographs from the Moon have seen a hydrogen "geocorona" glow extending to 3-4 Earth radii, gradually fading away. And satellite orbits at 400 kilometers are still degraded by air resistance. Of course, all this concerns the "neutral" atmosphere, held by gravity. Free electrons and ions (atoms missing electrons) are held by the Earth's magnetic field to even greater distances, though their density (at least near Earth) is smaller.

So, how far does the atmosphere go? Depends on how you measure it!

Answer 5

Technically about 100 Kilometers. People sometimes speak of 50 miles or 60 miles or 62 miles. The most widely accepted altitude where Space begins is 100 kilometers, which is about 62 miles.

The U.S. space agency awards astronaut status to persons who fly above 50 miles altitude.

For reference, note that a typical passenger jet cruises at an average altitude of about 30,000 feet which is just under six miles above Earth's surface. The most powerful military jets can't climb much above 100,000 feet, which would be just under 19 miles altitude.

The atmosphere gradually thins with increasing altitude so there is no tangible boundary between Earth's upper atmosphere and Space.

When people speak of "Outer Space," they refer to the vast region above Earth's atmosphere.

Answer 6

Space is official recognized as starting at about 63 miles. This was the requirement set for Spaceship One to achieve in order to be considered being launched into space and win the Ansara Prize for the first privately launched spaceship.

Answer 7

space starts 550 miles above the earth,.lowest above the earth to highest , troposphere then stratosphere then ionosphere, then the beginning of space ,as i said is 550 miles above the earth

Answer 8

9 miles

Answer 9

we technically are in space, earth is in space

Answer 10

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