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What is a Nebula?


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Project Information
Title: What is a Nebula?
Subject: Astronomy
Grade level: Middle school - grades 7-9
Project Type: Descriptive
Cost: Low
Awards: First Place (Canada Wide Virtual Science Fair)
Affiliation: Canada Wide Virtual Science Fair
Link: www.virtualsciencefair.org...
Background

A nebula (from Latin: "mist"; pl. nebulae, nebulę or nebulas) is an interstellar cloud of dust, hydrogen gas and plasma. It is the first stage of a star's cycle. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy was referred to as the Andromeda Nebula before galaxies were discovered by Edwin Hubble). Nebulae often form star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust and other materials 'clump' together to form larger masses, which attract further matter, and eventually will become big enough to form stars. The remaining materials are then believed to form planets, and other planetary system objects.

A planetary nebula is an emission nebula consisting of a glowing shell of gas and plasma formed by certain types of stars when they die. The name originated in the 18th century because of their similarity in appearance to giant planets when viewed through small optical telescopes, and is unrelated to the planets of the solar system. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.

See also: Nebula Basics and Images

Source: Wikipedia (All text is available under the terms of the Creative Commons Attribution-ShareAlike License)

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