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Extrasolar Planets, Star Clusters, and Nebulae

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Across
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The largest and densest regions of the interstellar medium, containing molecules as well as atoms and dust particles
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One of two types of star clusters, usually with fewer stars and an irregular appearance
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Another name for extrasolar planets, or planets that are believed to be orbiting a star outside our solar system
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A type of star cluster that usually is spherical, with many stars
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Thin gas and other small materials that exist between stars
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Groups of stars spaced much closer together than surrounding stars and held together by their gravity
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When a smaller body passes in front of a larger body;
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A dense dust cloud in space that blocks the light of stars and so appears dark
Down
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A type of rock
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What are thought to be clouds of glowing gas in space
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A grouping of stars rated as normal like the sun; can be as small as 1/10th the size of the sun or up to 10 times larger than the sun
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A nebula where the light of hot, bright stars near the nebular scatters, or reflects off the dust and appears blue in images
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The theoretical range of distance between a star and an orbiting planet that might have liquid water on the surface
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Planets that orbit a star beyond our solar system