
Only some are illustrations; the rest are real.

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This is the most detailed true-color image of the entire Earth to date. Image credit: NASA/GSFC
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Pulsar
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Titan
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Starburst galaxy M82 (also known as NGC 3031 or Bode's Galaxy) is a spiral galaxy about 12 million light-years away in the constellation Ursa Major.
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Messier 81
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M51:The Whirlpool Galaxy
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The centre of the Milky Way
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Mars
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The moon, imaged by the Galileo spacecraft during its journey to Jupiter.
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The Red Planet: Mars
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Barnard 30 in the Orion Nebula. Image credit: NASA
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Saturn. Image credit: NASA/JPL/SSI
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NGC 2903
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The solar cycle
Sun follows a relatively predictable 11-year cycle of solar activity. During the solar minimum, there's very little activity, and only a handful of sunspots. During the solar maximum, there can be frequent and powerful coronal mass ejections and X-ray flares.
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The Sun (you need 3-D glasses). Image credit: NASA
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The Sun again.
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The Orion Nebula
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Saturn's icy moon: Enceladus
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The Moon
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Lunar Phases
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Saturn Dione
Noorie