January 2004
World Almanac for Kids;2004, p205
The article offers information about nebulae. Historically, any fuzzy patch in the sky has been called a nebula, even galaxies and star clusters. Planetary nebulas come from the late stages of some stars, while star clusters and galaxies are star groupings. Emission nebulas, reflection nebulas, and dark dust clouds are regions of interstellar gas and dust that may be hundreds of light-years wide and are often birthplaces of stars. Emission nebulas give off a reddish glow, caused when their hydrogen gas is heated by newly formed, hot stars in the vicinity. Dark dust clouds, though still mainly gas, contain enough dust to absorb starlight and appear as dark nebulas.


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