Comets
Published on Nov 21, 2015
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PRESENTATION OUTLINE
DEFINITION
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A comet is an icy small Solar System body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail.
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BASIC INFO
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INFO
- It's made of rock, dust, and ice
- A comet is five miles across
- Found in Kuiper belt and Oot cloud
- They have one tail, and a nucleus
Photo by Steve Crane
QUESTIONS
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What happens to comets as they approach the sun?
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As the comet approaches the sun, the heat evaporates the ice in the comet turns straight into water vapor. As everything else evaporates, the water vapor goes straight back behind the comet and into the trail.
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What happened to comet Shoemaker-Levy?
Photo by Computer Science Geek
Shoe-maker levy broke apart and collided with Jupiter in 1994. It was the first comet to be observed orbiting a planet.
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Why is Hale-Bopp unique?
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Hale-Bopp was a unusually bright comet that was visible from earth for 18 months. Its twin blue-and-white tails were easily visible from earth.
Photo by NASA APPEL
What do you observe about the comet at it orbits around the Sun?
Photo by davedehetre
They go around the sun in a highly elliptical orbit. Like all orbiting bodies, comets follow Kepler's Laws - the closer they are to the Sun, the faster they move
Photo by Steve Crane
Why do comets only have tails when they are near the Sun?
Photo by NASA Goddard Photo and Video
They only have tails by the sun because when they are far from the sun, comets are extremely dark and cold. And as they come closer to the sun they start to warm up, and the debris blow away and form a tail behind the comet.
Photo by Ken_Lord
Where is the Kuiper belt and what is found in it?
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It begins near the orbit of Neptune and continues beyond Pluto. Inside the Kuiper belt is pluto's orbit and Neptune's orbit.
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FUN FACTS
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- The word comet comes from the Greek word
- Meaning "hair of the head" it came from
- He greek philosopher Aristotle
Photo by photographerglen
