Q:

How many miles are there to outer space?

A:

The lower boundary of outer space has been adjusted numerous times, but a final value was set at what is known as the Karman line, which is fixed at 62 miles above sea level, according to Universe Today. This boundary was defined early in the Space Age.

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Prior to the adoption of the Karman line, the boundary of space had been set at 50 miles, according to Universe Today, and pilots who exceeded this boundary were eligible to wear astronaut's wings. The modern definition takes physical forces into account. Above the Karman line, a flying object derives more lift from orbital velocity than it could from the flow of air over its flight surfaces.

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    Where does the sky end?

    A:

    The sky ends at the Karman line, which is located at about 67 miles above sea level. Above this line, space begins. However, technically, the sky does not end so much as the atmosphere, or sky, thins until there is no oxygen left.

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  • Q:

    How many miles high is Mount Everest?

    A:

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    How big is the solar system?

    A:

    Since there are no physical boundaries in space, the solar system is often regarded as the distance from the sun to Neptune, which is approximately 30 astronomical units and equals approximately 2,790,000,000 miles. Astronomical units, which are used by astronomers, each equal 93 million miles.

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    How many stars are there?

    A:

    The observable universe contains an estimated 6.8 x 10^24, or 6.8 septillion, stars. To reach this estimate, astronomers conducted an exhaustive inventory of the stars in the Milky Way galaxy, made reasonable inferences regarding the stars that cannot be seen from Earth and applied that model to the other galaxies within the universal horizon.

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