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2018 Solar System and Space Vocab

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Across
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the small, dense core of a giant star that remains after the star has lost its exterior matter
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The amount of light energy emitted per second
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solid, interplanetary particles passing through Earth’s atmosphere
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The different appearances of the Moon as it orbits Earth
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a large cloud of gas and dust in space
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a total or partial obscuring of one celestial body by another
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Massive systems of stars, dust, and gas held together by gravity
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The time it takes a planet to move completely around the Sun
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the average distance from Earth to the Sun, equals 149,600,000 km
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a region of space from which no matter or radiation can escape
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the remaining portion of a meteoroid that reaches Earth’s surface
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an imagi- nary line through the center of the planet
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The planets beyond the inner planets—Jupiter, Saturn, Nep- tune, and Uranus
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When a supergiant star explodes before dying
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two atomic nuclei combine to form a larger nucleus with a higher mass
Down
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a star composed mainly of neutrons, they are what remain of stars after supernova explosions
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The time it takes for one rotation
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Theory that expansion of the universe began about 14 billion years ago
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An object that revolves around a planet
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The four planets closest to the Sun—Mercury, Venus, Earth, and Mars
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he observed luminosity of a celestial body, such as a star, as observed from Earth
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An oval
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the distance light travels in one year
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Sun-sized (about one to eight solar masses) stars use up their fuel become ____ ________.
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a small, icy body in a highly elliptical orbit around the Sun