Space

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Equinox

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the time or date (twice each year) at which the sun crosses the celestial equator

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Project Mercury

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Project Mercury was the first human spaceflight program of the United States. It ran from 1959 through 1963 with the goal of putting a human in orbit around the Earth. The Mercury-Atlas 6 flight on February 20, 1962, was the first American flight to achieve this goal

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Project Gemini

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Project Gemini was the second human spaceflight program of NASA, the civilian space agency of the United States government. Project Gemini was conducted between Projects Mercury and Apollo, with ten manned flights occurring in 1965 and 1966

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Project Apollo

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The Apollo program was the United States spaceflight effort which landed the first humans on Earth's Moon.

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Radio Telescope

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an instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites.

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Comet

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a celestial object consisting of a nucleus of ice and dust

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Spaceship

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A device used to get into space

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Solar Eclipse

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when the moon is in the middle of the sun and earth

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solstice

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either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.

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meteorite

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a meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground. More than 90 percent of meteorites are of rock, while the remainder consist wholly or partly of iron and nickel.

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meteor

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a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.

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comet

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a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun

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mars

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Astronomy a small, reddish planet that is the fourth in order from the sun and is periodically visible to the naked eye.

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mercury

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Astronomy a small planet that is the closest to the sun in the solar system, sometimes visible to the naked eye just after sunset.

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Venus

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Astronomy the second planet from the sun in the solar system, the brightest celestial object after the sun and moon and frequently appearing in the twilight sky as the evening or morning star.

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Jupiter

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Astronomy the largest planet in the solar system, a gas giant that is the fifth in order from the sun and one of the brightest objects in the night sky

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Saturn

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Astronomy the sixth planet from the sun in the solar system, circled by a system of broad, flat rings

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Uranus

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Astronomy a distant planet of the solar system, seventh in order from the sun, discovered by William Herschel in 1781.

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Neptune

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Astronomy a distant planet of the solar system, eighth in order from the sun, discovered in 1846.

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pluto

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Astronomy the most remote known planet of the solar system, usually ninth in order from the sun, discovered in 1930 by Clyde Tombaugh.