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高級超級版主 | 2009-3-26 10:31:13

Star EGGs in the Eagle Nebula

影像提供: J. Hester & P. Scowen (Arizona State U.), HST, NASA
Explanation:
     Where do stars form? One place, star forming regions known as "EGGs", are uncovered at the end of this giant pillar of gas and dust in the Eagle Nebula (M16). EGGs, short for evaporating gaseous globules, are dense regions of mostly molecular hydrogen gas that fragment and gravitationally collapse to form stars. Light from the hottest and brightest of these new stars heats the end of the pillar and causes further evaporation of gas - revealing yet more EGGs and more young stars. This picture was taken by the Wide Field and Planetary Camera on board the Hubble Space Telescope.
說明:

      恆星形成於何處?在這張由哈伯太空望遠鏡的廣角行星相機所拍攝之照片裡,可以看到許多"星蛋" (evaporating gaseous globules--蒸發中的雲氣球, EGGs)正從巨大氫氣和塵埃柱的頂端露出來。 這些在老鷹星雲 (Eagle Nebula; M16)內的巨大氣柱,長度約有數光年,它們的密度非常高,所以內部已經發生重力塌縮,開始形成新的恆星。氣柱上方的年輕亮星,正在發出熾熱且強烈的輻射,使氣柱內較低密度的物質更加快速地蒸發,露出更多星蛋和新恆星的恆星育嬰室。
資料來源: Scientific American
                 Department of Physics, NCKU

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