charles 2009-3-23 10:45
半人馬座Ω星團
Omega Centauri
[img]http://i1.tinypic.com/2rpfyag.jpg[/img]
影像版權與提供: Steve Crouch
[color=navy]Explanation:[/color]
Centaurus, the Centaur, is one of the most striking constellations in the southern sky. The Milky Way flows through this celestial expanse whose wonders also include the closest star to the Sun, Alpha Centauri, and the largest globular star cluster in our galaxy, Omega Centauri. This gorgeous wide-field telescopic view of Omega Centauri shows off the cluster of about 10 million stars and the surrounding star field, with very faint dust clouds and distant background galaxies. Omega Cen itself is about 15,000 light-years away and 150 light-years in diameter - one of 150 or so known globular star clusters that roam the halo of our galaxy. The stars in globular clusters are much older, cooler, and less massive than our Sun.
[color=navy]說明:[/color]
半人馬座(Centaurus) 是南天星空中最讓人印象深刻的一個星座。 天空上本銀河系穿過這個擴張中的天體,其中的一顆星是最靠近我們太陽的一個恆星系統,稱為半人馬座 a 星(Alpha Centauri)以及本銀河系最大的球狀星團, 半人馬座Ω星團(Omega Centauri)。 這張廣角的望遠鏡所拍攝的半人馬座Ω星團,大約有一千萬顆星,以及參雜背景星,及一些暗的星塵雲氣及很遠的星系。 半人馬座Ω星團距離我們約 15,000 光年,半徑約 150 光年,是目前在 漫遊在本銀河系暈(halo)知道的150個星團之一的。 在半人馬座Ω星團的星比起我們的太陽 年齡更大,更紅及重量較輕。
[size=2]資料來源: Scientific American
Department of Physics, NCKU[/size]