The science that deals with the material universe beyond the earth's atmosphere.

An expert in astronomy; a scientific observer of the celestial bodies.

The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

A group of stars forming a recognizable pattern.

A theory in which the earth is regarded as being at the center of the solar system, usually referring to the system of Claudius Ptolemy.

A cosmological model in which the Sun is assumed to lie at or near a central point while the Earth and other bodies revolve around it.

A celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun.

The force of attraction by which terrestrial bodies tend to fall toward the center of the earth.

The sun together with all the planets and other bodies that revolve around it.

National Aeronautics and Space Administration.

A meteoroid that has entered the earth's atmosphere.

An optical instrument for making distant objects appear larger and therefore nearer.

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.

the time or date at which the sun crosses the celestial equator, when day and night are of equal length.

A imaginary line about which a body rotates.

An imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.

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Sun-Earth-Moon

Question	Answer
astronomy	The science that deals with the material universe beyond the earth's atmosphere.
astronomer	An expert in astronomy; a scientific observer of the celestial bodies.
Rotation	Turning around on an axis.
Revolution	Instance of revolving.
orbit	The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
constellation	A group of stars forming a recognizable pattern.
Geocentric Theory	A theory in which the earth is regarded as being at the center of the solar system, usually referring to the system of Claudius Ptolemy.
Heliocentric Theory	A cosmological model in which the Sun is assumed to lie at or near a central point while the Earth and other bodies revolve around it.
comet	A celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun.
gravity	The force of attraction by which terrestrial bodies tend to fall toward the center of the earth.
Solar System	The sun together with all the planets and other bodies that revolve around it.
NASA	National Aeronautics and Space Administration.
meteor	A meteoroid that has entered the earth's atmosphere.
telescope	An optical instrument for making distant objects appear larger and therefore nearer.
solstice	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.
equinox	the time or date at which the sun crosses the celestial equator, when day and night are of equal length.
axis	A imaginary line about which a body rotates.
equator	An imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.

Created by: 1969535473

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