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| A cloud of comets found beyond the orbit of Pluto. Gravity pulls comets from here into our solar system. |
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| The extremely high density collapsed core of a supernova that has the highest mass of any celestial object. Gravitational force is so strong that not even light can escpae. |
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| A meteoroid that strikes the surface of a moon or planet. |
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| A galaxy with twisting arms extending from a large bar of stars and gas that passes through the center of the galaxy. |
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| The average distance between Earth adn the sun, about 150 million km. |
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| A graph that shows the relationship between a star's surface temperature and absolute magnitude. |
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| The region of the solar system that is between the orbits of Mars and Jupiter where most asteroids orbit. |
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| A meteoroid that burns up in the Earth's atmosphere. |
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| A solid fragment of rock and/or metal traveling through space. |
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| A depression in the ground created by an impact or explosion. |
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| The distance that light travels in a year, about 9.5 trillion kilometers. |
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| The high density collapsed core of a supernova that contains only neutrons. |
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| The galaxy that contains the Sun and the solar system. |
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| A large cloud of gas and dust in intergalactic space. The gas is mostly hydrogen gas (H). |
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| A continuous series of meteorids passing through Earth's atmosphere. |
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| A football or round shaped galaxy with no internal structure or spiral arms. |
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| A galaxy with arms of bright stars, dust and gas that begin and twist outward from teh center. |
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| A gigantic explosion in which a high mass star fused carbon into iron, causing core collapse and throwing its outer gas layers into space. |
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| The smallest of galaxies and having many different shapes. |
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| A mass of frozen gasses, rock and dust that forms a bright coma as it approaches the sun. |
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| A small, hot, dim star that is in the late stages of a very old low mass star. Eventually will become a black dwarf when all energy is consumed by the core. |
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| Traveling or taking place among the stars of the Milky Way galaxy. |
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| A nickname for a meteor seen from Earth. |
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| A large, reddish star late in its life cycle. |
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| A very large, high mass star in which fusion creates heavier elements and expands its size, eventually to become a supernova. |
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| The collision of atomic nuclei. Creates an enormous amount of heat and light energy. |
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| A rocky and/or metallic object that orbits the sun, usually in a band between the orbits of Mars and Jupiter. |
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| The closest star system to the Sun, consisting of a cluster of 3 stars. |
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| The closest star to Earth. |
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