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1 gigametre
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To help compare different distances this page lists lengths starting at 10 metres (1 gigametre (Gm) or 1 million kilometres). * 1.4 Gm — Diameter of Sun * 1.5 Gm — (proposed) Expected orbit from Earth of the James Webb Space Telescope * 2.19 Gm — Closest approach of Comet Lexell to Earth, happened on 1 July 1770; closest comet approach on record * 3 Gm — Total length of "wiring" in the human brain. * 4.2 Gm — Diameter of Algol B * 5.0 Gm — Closest approach of Comet Halley to Earth, happened on 10 April 837 * 5.0 Gm — (proposed) Size of the arms of the giant triangle shaped Michelson interferometer of the Laser Interferometer Space Antenna (LISA) planned to start observations in or around 2015. * 7.9 Gm — Diameter of Gamma Orionis * 9.0 Gm — Estimated diameter of the event horizon of , the supermassive black hole in the center of the Milky Way galaxy 
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