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Space Crossword Puzzle

A crossword puzzle to test your knowledge on space.
Across
a small rocky body orbiting the sun.
positioned in or relating to the sky, or outer space as observed in astronomy
a small, reddish planet that is the fourth in order from the sun and is periodically visible to the naked eye.
an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays.
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.
a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure.
a celestial body moving in an elliptical orbit around a star.
the sixth planet from the sun in the solar system, circled by a system of broad, flat rings.
a small planet that is the closest to the sun in the solar system, sometimes visible to the naked eye just after sunset.
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.
the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
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.
a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Down
the galaxy that contains our Solar System.
the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
a distant planet of the solar system, eighth in order from the sun, discovered in 1846.
the star at the center of the Solar System.
a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.
a region of space having a gravitational field so intense that no matter or radiation can escape.
a small planetary body orbiting the sun, discovered in 1930 by Clyde Tombaugh.
a fixed luminous point in the night sky that is a large, remote incandescent body like the sun.
a distant planet of the solar system, seventh in order from the sun, discovered by William Herschel in 1781.
the planet on which we live; the world