Explore planetary nebulae. Learn the definition of a planetary nebula and understand its structure and chemical composition. Find out how a...
planetaryadjective Word HistoryTo learn the origins of the names of the planets is to have a little lesson in Roman mythology. Mercury moves fastest through the sky and was named after the swift-footed messenger of the gods, Mercury. Venus, the morning and evening star, was named after the...
planetary nebula - a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star cloud - any collection of particles (e.g...
Facts About Planetary Nebula Lesson Summary Frequently Asked Questions What is the temperature of the planetary nebula? The temperature of the gas surrounding a planetary nebula is about 10,000 degrees Celsius. The temperature of the core of a planetary nebula can be between 25,000 and 200,000...
Planetary nebula, any of a class of bright nebulae that are expanding shells of luminous gas expelled by dying stars. They have a relatively round compact appearance rather than the chaotic patchy shapes of other nebulae—hence their name, which was give
- A planetary nebula is a type of emission nebula consisting of an expanding, glowing s*** of ionized gas ejected from red giant stars late in their lives...- The Helix Nebula (also known as NGC 7293 or Caldwell 63) is a planetary nebula (PN) located in the constellation Aquarius. Di...
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The meaning of PLANETARY is of, relating to, being, or resembling a planet. How to use planetary in a sentence.
Unlike diffuse emission nebula, these have a more clearly defined appearance, usually circular in shape, which reminded William Herschel of a planet when he first observed them in the 1780s. Not all stars end their days in the relative serenity of a planetary nebula. A star that’s much mor...
The planets and other objects that circle the Sun are thought to have formed when part of an interstellar cloud of gas and dust collapsed under its own gravitational attraction and formed a disk-shapednebula. Further compression of the disk’s central region formed the Sun, while the gas and...