Star - A star is a luminous sphere of hydrogen & helium gas held together by the force of gravity, Solar System - A solar system is made up of a star and all the celestial bodies that orbit the star., Planet - (a) orbits a star, (b) has a large enough mass to be spherical & (c) has cleared the region around its orbit of other celestial bodies , Asteroid - An Asteroid is a large lump of rock & metal that orbit the sun, Galaxy - A galaxy is a system of millions of stars, gas & dust held together by the force of gravity, Comet - Comets are large lumps of ice, gases & dust that orbit the sun, Dwarf Planet - A Dwarf Planet is a planet that does not meet all the criteria to be a planet, Moon - A moon is a naturally occurring satellite,

1st Year Earth & Space

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