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Short orbital-period comets are thought to originate from the Kuiper Belt, while long orbital-period comets are believed to be from the Oort Cloud.
The Kuiper Belt lies beyond the planet Neptune (between 30 astronomical units [AU] and 55 AU from the Sun), and the Oort Cloud, which is thought to be a spherical cloud surrounding the solar system, lies about 50,000 AU from the Sun.
But did you know that a comet's tail is evidence that it's melting?
As a comet passes by the Sun on its orbital path, it starts to melt.
Because comets are not visible all the time, they are usually special and even spectacular for people on Earth. Comets travel in an orbit; a short orbital-period comet is one that takes 200 years or less to go around the Sun, and a long orbital-period comet takes more than 200 years—often thousands or even millions of years.If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help.Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot. They want to understand the entire universe—the nature of the Sun, Moon, planets, stars, galaxies, and everything in between.Their theories are then applied to human-scale projects to bring people new technologies, like computers, lasers, and fusion energy.
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Objects in the Oort Cloud are made up of frozen water, frozen ammonia, and frozen methane.