Copyright:
Andr� van der Hoeven,
Neil Fleming &
Michael Van Doorn
原文:
In the lower left corner, surrounded by blue spiral arms, is spiral galaxy M81. In the upper right corner, marked by red gas and dust clouds, is irregular galaxy M82. This stunning vista shows these two mammoth galaxies locked in gravitational combat, as they have been for the past billion years. The gravity from each galaxy dramatically affects the other during each hundred million-year pass. Last go-round, M82’s gravity likely raised density waves rippling around M81, resulting in the richness of M81’s spiral arms. But M81 left M82 with violent star forming regions and colliding gas clouds so energetic the galaxy glows in X-rays. This big battle is seen from Earth through the faint glow of an Integrated Flux Nebula, a little studied complex of diffuse gas and dust clouds in our Milky Way Galaxy. In a few billion years only one galaxy will remain. Follow APOD on: Facebook, Google Plus, or Twitter
中文翻譯:
在左下角，被藍色螺旋臂包圍的是螺旋星系 M81。在右上角，由紅色氣體和塵埃雲標記的是不規則星系 M82。這幅驚人的景象展示了這兩個巨大星系正在進行重力之戰，這場戰鬥已經持續了十億年。每次過境時，兩個星系的重力互相影響，造成了劇烈的變化。在上一次交鋒中，M82 的重力可能引起了 M81 周圍密度波的波動，導致了 M81 螺旋臂的豐富。但對於 M82 來說，M81 則使它產生了暴力的星形成區域和碰撞的氣體雲，這些氣體雲如此活躍，以至於該星系在 X 射線下發光。這場盛大的戰鬥從地球上可以看到，透過稀薄的綜合通量星雲，這是一個仍然不太被研究的複雜星際氣體和塵埃雲，在我們的銀河系內部。在幾十億年後，只會剩下一個星系。
#M81 #M82 #銀河系 #星系碰撞 #天文學 #宇宙之美 #重力之戰 #星際旅程 #APOD
來源:NASA每日圖片
