Copyright::
Francesco Antonucci
中文翻譯:
星星是如何形成的？NASA的廣域紅外線調查探測器（WISE，後來改為NEOWISE）拍攝的W5星形成區域的紅外線圖像提供了清晰的線索，顯示出中心的巨大星星比邊緣的星星更年長。造成這種情況的一個可能原因是，位於中心的老星實際上正在觸發邊緣新星的形成。
這個觸發的星星形成過程發生在熱烈的氣體外流壓縮冷卻氣體，這些冷氣體形成足夠密集的結構，使它們能夠引力收縮成星星。在這幅科學著色的紅外線圖像中，壯觀的柱狀結構是由於熱氣體的外流慢慢蒸發而留下的，進一步提供了視覺線索。
W5也被稱為Westerhout 5 (W5) 和IC 1848。與IC 1805一起，這些星雲形成了一個被稱為“心臟與靈魂星雲”的複雜星形成區域。這幅圖像突顯了W5的一部分，涵蓋約2,000光年，並且富含星形成的柱狀結構。W5位於約6,500光年以外，朝向卡西奧佩亞座。
#星星形成 #星雲 #W5 #心臟與靈魂星雲 #NASA #NEOWISE #太空探索 #天文學 #宇宙之美 #紅外線圖像
原文:
How do stars form? Images of the star forming region W5 like those in the infrared by NASA’s Wide Field Infrared Survey Explorer (WISE, later NEOWISE) satellite provide clear clues with indications that massive stars near the center of empty cavities are older than stars near the edges. A likely reason for this is that the older stars in the center are actually triggering the formation of the younger edge stars. The triggered star formation occurs when hot outflowing gas compresses cooler gas into knots dense enough to gravitationally contract into stars. In the featured scientifically colored infrared image, spectacular pillars left slowly evaporating from the hot outflowing gas provide further visual clues. W5 is also known as Westerhout 5 (W5) and IC 1848. Together with IC 1805, the nebulas form a complex region of star formation popularly dubbed the Heart and Soul Nebulas. The featured image highlights a part of W5 spanning about 2,000 light years that is rich in star forming pillars. W5 lies about 6,500 light years away toward the constellation of Cassiopeia. APOD Turns 30!: Free public lecture in Cork, Ireland tomorrow (Tuesday) at 7 pm
來源:NASA每日圖片
