An emission nebula (NGC7000) located near the first magnitude star Deneb in Cygnus. It was named after its shape, which resembles the North American continent. Its apparent size is about 100 arc minutes. It is 2000 light years away from Earth, but its actual size is about 50 light years. The Pelican Nebula is located next to it, separated from the dark nebula that forms the Gulf of Mexico. It is thought that the two nebulae are ionized by an excited star behind the dark nebula. This region is one of the active star-forming regions in the Milky Way, and contains a mixture of emission nebulae, dark nebulae, and reflection nebulae. [Okamura Sadanori] [References] | | |A diffuse nebula in Cygnus (the large blue area on the left of the photo). NGC7000. An emission nebula near Deneb, the part that corresponds to the Gulf of Mexico is a dark nebula. The pale blue area on the right of the photo is the Pelican Nebula. A composite of infrared and visible light images taken by the Spitzer Space Telescope © NASA/JPL-Caltech "> North America Nebula Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
はくちょう座の1等星デネブの近くにある発光星雲(NGC7000)。その形が北アメリカ大陸に似ていることからこの名前がついた。見かけの大きさは約100分角。地球からの距離は2000光年で実際の大きさは約50光年である。メキシコ湾を形づくっている暗黒星雲を挟んで、隣にペリカン星雲がある。この暗黒星雲の背後にある励起星によって、二つの星雲が電離されていると考えられている。この領域は、天の川の中の活発な星生成領域の一つで、発光星雲、暗黒星雲、反射星雲が入り交じって存在している。 [岡村定矩] [参照項目] | | |はくちょう座にある散光星雲(写真左の大きな青色部分)。NGC7000。デネブの近くにある発光星雲で、メキシコ湾にあたる部分が暗黒星雲。写真右の淡い青色部分はペリカン星雲である。スピッツァ宇宙望遠鏡による赤外線画像と可視光画像を合成©NASA/JPL-Caltech"> 北アメリカ星雲 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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