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Solar System

Halley's Comet

planet Neptune, Halley, solar system, planets, orbit

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>  Observation and Exploration of Halley's Comet

Halleyís Comet, comet, or ball of ice and dust orbiting the Sun, that can be seen from Earth once about every 76 years. It travels in a very elongated path around the Sun, in a direction opposite to that of the planets in the solar system. The path of the comet extends from near the Sun to beyond the planet Neptune. The periods between its approach to Earth usually vary from 75 to 79 years because the gravitational forces of other planets change the cometís orbit slightly. The cometís scientific designation is 1P/Halley, the first comet listed in the official catalog of comets.

Article key phrases:

planet Neptune, Halley, solar system, planets, orbit, dust, periods, Earth, Sun, approach, years

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