Halley's Orbit

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Title: Halley's Orbit

Essay Details:

Subject: Science

Author: Nancy E

Date: March 3, 2017

Level: College

Grade: A

Length: 1 / 226

Essay text:

In 1986, five spacecraft from the USSR, Japan, and the European Community visited Comet Halley; ESA's Giotto obtained close-up photos of Halley's nucleus (above and right). NASA's technology demonstration spacecraft DS1 imaged the nucleus of Comet Borrelly in 2001. The nucleus of Comet Halley is approximately 16x8x8 kilometers. Contrary to prior expectations, Halley's nucleus is very dark: its albedo is only about 0.03 making it darker than coal and one of the darkest objects in the solar system. The density of Halley's nucleus is very low: about 0.1 gm/cm3 indicating that it is probably porous, perhaps because it is largely dust remaining after the ices have sublimed away...

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