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Space Voab

meteoroid a small piece of metal or stone that orbits the sun
meteor a streak of light in the sky that forms when a piece of rock from space burns up in Earth's atmosphere (related term: shooting star)
meteorite a piece of rock or metal from space that strikes Earth's surface
star a massive ball of gas in outer space that gives off heat, light, and other forms of radiation
comet a body of ice and dust that travels in a long, narrow orbit around the Sun
asteroid a small object made of rock or metal that orbits the sun
Hertzprung-Russell diagram a two-dimensional graph, devised independently by Ejnar Hertzsprung
planetary nebula a large cloud of gas and dust in outer space ejected by an aging star near the end of its life cycle
solar nebula the cloud of dust and gas created by the gravitational collapse of interstellar molecules from which it is believed the solar system was created
white dwarf a relatively small, dense star at the end of its life cycle, which generates little or no energy and has contracted to its densest state
giant star a star at the stage in its life cycle when it stops burning hydrogen, begins burning helium, and expands to a large, low-density star
supergiant star a star that is larger, brighter, and more massive than a giant star, being thousands of times brighter than the Sun and having a relatively short lifespan
neutron star a small-diameter, very dense star composed of neutrons held together by gravity
black hole a space object with surface gravity great enough that not even light waves can escape
galaxy a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
milky way galaxy the galaxy containing the Sun and its solar system, along with millions of other stars in a spiraling pattern, part of which can be seen as a band of "milky" diffuse light across the night sky
sun spot a cooler darker spot on the surface of the Sun
Created by: amauri.021