astronomy The study of objects in outer space
astronomy The study of objects in outer space – outside Earth’s atmosphere
universe Everything that exists, including objects & energy, throughout time & space
solar system The sun and celestial bodies that orbit around it
rotation The spin of an object around its center point or axis
revolution The orbit of one object around another object
equinox The position of the Sun is exactly over the equator
solstice Moment in the year when the Sun’s path is farthest north or south from Earth’s equator
waxing The lit part of the moon becomes larger
waning The lit part of the moon becomes smaller
tide The rising and falling of the surface of the ocean caused by the gravitational force of the moon & sun
eclipse The movement of one object in the solar system into the shadow of another object, blocking it from view http: //www. fearofphysics. com/Sun. Moon/eclipse. html
planet Celestial body in orbit around the sun
moon Natural satellite that revolves around a planet or other celestial object other than a star http: //www. fearofphysics. com/Sun. Moon/sunmoon 1. html
asteroid Chunk of rock and metal that orbits the Earth
comet Chunk of ice and rock that orbits the Sun Halley’s comet comes around every 75 years/2061
meteoroid Small, rocky particles that move through space
meteor Meteoroids that enter Earth’s atmosphere, producing a streak of light
star Large sphere of hydrogen gas hot enough for nuclear reactions to occur in its core
Light year The distance light travels in one year
galaxy Huge collection of stars, gas, and dust
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