Copyright:
原文:
How could a galaxy become shaped like a ring? The rim of the blue galaxy pictured on the right is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. That galaxy, AM 0644-741, is known as a ring galaxy and was caused by an immense galaxy collision. When galaxies collide, they pass through each other — their individual stars rarely come into contact. The ring-like shape is the result of the gravitational disruption caused by an entire small intruder galaxy passing through a large one. When this happens, interstellar gas and dust become condensed, causing a wave of star formation to move out from the impact point like a ripple across the surface of a pond. The intruder galaxy is just outside of the frame taken by the Hubble Space Telescope. This featured image was taken to commemorate the anniversary of Hubble’s launch in 1990. Ring galaxy AM 0644-741 lies about 300 million light years away.
中文翻譯:
🌌 有冇諗過一個星系係點樣變成環形呢？我們來看看「AM 0644-741」這個環星系，它的邊緣形成了一個直徑達150,000光年的巨大環狀結構，裡面充滿了新形成的極為明亮且巨大的恆星。這個環星系因為一場龐大的星系碰撞而形成。
當星系相撞時，它們會彼此穿過，個別的恆星實際上幾乎不會碰撞。環狀結構是由於一個小型入侵星系穿越較大型星系所引起的引力擾動所造成的。當這種情況發生時，星際氣體和塵埃會被壓縮，形成一波波的恆星形成現象，像是波紋一樣向外擴散。
那個小型的入侵星系就在哈勃太空望遠鏡拍攝的畫面外。這幅圖片是為了慶祝哈勃於1990年發射的周年紀念而拍攝的。環星系AM 0644-741距離我們大約有3億光年遠。
#環星系 #AM0644_741 #宇宙奧秘 #星系碰撞 #哈勃太空望遠鏡 #星際氣體 #恆星形成 #科技與宇宙 #驚奇的科學 #宇宙探索
來源:NASA每日圖片
