Sky

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Sky is the region of space visible from the earth. The sky consists of the atmosphere, which extends hundreds of miles or kilometers above the earth. The atmosphere is composed chiefly of nitrogen and oxygen. In addition, it contains tiny water droplets and ice crystals in the form of clouds and precipitation. Smoke, dust particles, and chemical pollutants may also fill the sky over cities.

Magnitude

Magnitude is the scale used by astronomers to measure the brightness of objects in space. The brighter a star or planet, the lower its magnitude… See more »

Parsec

Parsec is a unit that astronomers use to measure extremely long distances, such as the distance between stars. A parsec equals 3.26 light-years, or… See more »

Horizon

Horizon is the distant, curved line where the earth and sky seem to meet. Most people near the ground on land cannot see to the horizon because… See more »

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