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In 1781 the French astronomer Charles Messier published his catalog of star clusters and nebulae. Officially, the principal catalog of these objects...


= Encyclopedia Article; = Research Update
Some objects in the Caldwell catalog. (a) Cat's Eye Nebula, C6 (P. Harrington, K. Borkowski, B. Balick, NASA). (b) Blinking Nebula, C15 (B. Balick et al., NASA). (c) Saturn Nebula, C55 (B. Balick et al., NASA). (d) Ghost of Jupiter, C59 (B. Balick et al., NASA). (e) Centaurus A radio galaxy, taken during the commissioning of the FORS2 spectrograph at the Very Large Telescope, January 31, 2000 (European Southern Observatory). (f) Eta Carinae Nebula, C92 (J. Morse, K. Davidson, NASA). All images except e are from the Hubble Space Telescope.
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