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1.Titan
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The other photos are of Venus, Uranus and Saturn.
2.Pleiades
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The other star clusters are called NGC 3572, NGC 346 and Messier 92.
3.Neutron Star
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The other images depict a brown dwarf, debris around a white dwarf and a gas disc around a Wolf-Rayet star.
4.Pluto
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The other photos are of Ganymede, Callisto and Europa.
5.Crab Nebula
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The other nebulae are the Orion Nebula, the Cat's Eye Nebula and the Carina Nebula.
6.Andromeda Galaxy
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The other galaxies are called IC 2006, NGC 4526 and NGC 1427A.
7.Quasar
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The other images depict planets orbiting the pulsar named Lich (which were the first extrasolar planets to be discovered), a supernova and a magnetar.
8.Ceres
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The other photos are of Mimas, Ariel and Phobos.
9.Olympus Mons
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The other images are of Hecates Tholus and Ulysses Tholus on Mars, and Loki Patera on Io.
10.Horsehead Nebula
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The other nebulae are the Cone Nebula, the Crescent Nebula and IC 2177.
11.Black Hole
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The other images depict a symbiotic binary, a T Tauri star and a synestia.
12.Venus
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The image is an artist's concept of the Soviet lander Venera 9 on Venus. The other images are a photo taken by the Curiosity rover on Mars, an artist's concept of the planned Dragonfly rotorcraft flying over Titan, and an artist's concept of the proposed Europa Lander mission.
13.Lenticular Galaxy
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The other three are examples of ring, barred spiral and spiral galaxies.
14.Eris
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The other images depict Makemake, Haumea and Sedna.
15.Enceladus
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The other photos are of Dione, Charon and Miranda.