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Bookmark or Share- What Is a Comet? | NASA Space Place – NASA Science for KidsComets, such as the comet ISON pictured here, are thought to hold material from the time when the Sun and planets were forming. They are like giant, frozen time capsules in our solar system. Credit: NASA/MSFC/Aaron Kingery.
- Comets - NASA ScienceComets are cosmic snowballs of frozen gases, rock, and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the Sun for millions of ...
- Comet - WikipediaQ3559. A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma.
- Comets: Facts - NASA ScienceComets actually have two tails―a dust tail and an ion (gas) tail. Most comets travel a safe distance from the Sun―comet Halley comes no closer than 89 million kilometers (55 million miles). However, some comets, called sungrazers, crash straight into the Sun or get so close that they break up and evaporate.
- Green comet will appear in the night sky for the first time since the ...01:42 - Source: CNN Business. A recently discovered comet will soon swing by Earth for the first time in 50,000 years. The green comet will make its closest approach between February 1 and 2.
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