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The Heart Nebula, IC 1805, Sharpless 2-190, lies some 7500 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. This is an emission nebula showing glowing gas and darker dust lanes. The nebula is formed by plasma of ionized hydrogen and free electrons. The very brightest part of this nebula (the knot at the right) is separately classified as NGC 896, because it was the first part of this nebula to be discovered. The nebula's intense red output and its configuration are driven by the radiation emanating from a small group of stars near the nebula's center. This open cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun, and many more dim stars that are only a fraction of our Sun's mass. The cluster used to contain a microquasar that was expelled millions of years ago. Image:Melotte15HunterWilson.jpg|Open Cluster Melotte 15 at the core of IC 1805. Image:Heart and Soul nebulae.jpg|The Heart and Soul nebulae are seen in this infrared mosaic from NASA's WISE telescope. Image:NGC 896 using 32 inch Schulman telescope on Mt. Lemmon, AZ.jpg|NGC 896 using 32 inch Schulman telescope on Mt. Lemmon, AZ. (orientation modified) == See also == * Soul Nebula 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heart Nebula」の詳細全文を読む スポンサード リンク
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