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In Depth | 1P Halley – NASA Solar System Exploration Halley is often called the most famous comet because it marked the first time astronomers understood comets could be repeat visitors to our night skies Astronomers have now linked the comet's appearances to observations dating back more than 2,000 years
In Depth | 2P Encke – NASA Solar System Exploration Overview Comet 2P Encke is a small comet Its nucleus measures approximately 2 98 miles (4 8 kilometers) in diameter, which is about a third of the size of the object hypothesized to have led to the demise of the dinosaurs It takes 3 30 years for Enke to orbit the sun once
C 1995 O1 (Hale-Bopp) - NASA Solar System Exploration Comet Hale-Bopp (C 1995 O1) was discovered on 23 July 1995 by two independent observers, Alan Hale (Cloudcroft, N M ) and Thomas Bopp (Stanfield, AZ), and is showing potential of putting on a spectacular display as it nears its 1997 perihelion
Kuiper Belt and Oort Cloud - NASA Solar System Exploration Occasionally, giant molecular clouds, stars passing nearby, or tidal interactions with the Milky Way’s disc disturb the orbit of one of these bodies in the outer region of the Oort Cloud, causing the object to streak into the inner solar system as a so-called long-period comet
Pluto By the Numbers - NASA Solar System Exploration The distance from the center of an object to its equator The outer or uppermost part of a planet, moon, asteroid, comet or other body The gravitational acceleration experienced at its surface at the equator The speed needed for an object to break away from the gravitational pull of a planet or moon
galileo0302. qxd - NASA Solar System Exploration The discovery of Comet Shoemaker-Levy 9 in March 1993 provided an excit-ing opportunity for Galileo's science teams and other astronomers The comet was breaking up as it orbited Jupiter and was headed to dive into the giant planet's atmosphere in July 1994