The Flame Nebula, also called NGC 2024, is a large star-forming region in the constellation Orion that lies about 1,400 light-years from Earth. It’s a portion of the Orion Molecular Cloud Complex, which includes such famous nebulae as the Horsehead Nebula and Orion Nebula. This image focuses on the […]
Stars are born from clouds of gas and dust that collapse under their own gravitational attraction. As the cloud collapses, a dense, hot core forms and begins gathering dust and gas, creating an object called a “protostar.” 恒星是由气体云和尘埃在自身引力作用下坍缩而形成。随着云团坍缩，会形成一个致密、炽热的核心，并开始聚集尘埃和气体，形成一个称为“原恒星”的物体。 This
NGC 2438 is a planetary nebula, formed after the death of a Sun-like star. The medium-sized star would have expelled its outer layers of gas into space as it died, leaving behind a white-dwarf core. A halo of glowing gas over 4.5 light-years across surrounds the nebula’s brighter inner ring. M
N44是一个复杂的星云，充满了发光的氢气、黑暗的尘埃带、大质量恒星和许多不同年龄的恒星群。然而，它最显着的特征之一是被称为“超级气泡”的黑暗星空间隙，在这张哈勃太空望远镜图像中上部中央区域可见。 这个黑洞大约有250光年宽，它的存在仍然是一个谜。气泡内部的大质量恒星喷出的恒星风可能赶走了气体，但这与测量到的气泡中的风速不一致。另一种可能性是，由于星云中充满了大质量恒星，这些恒星会在巨大的爆炸中消亡，古老超新星不断膨胀的外壳塑造了宇宙洞穴。 天文学家在超级气泡附近发现了一颗超新星遗迹，并确定超级气泡内部和边缘的恒星之间存在大约 500 万年的年龄差异，表明存在多个连锁反应的恒星形成事件。超级气泡
2021年10月31日 Dark Matter in a Simulated Universe Illustration Credit & Copyright: Tom Abel & Ralf Kaehler (KIPAC, SLAC), AMNH Explanation: Is our universe haunted? It might look that way on this dark matter map. The gravity of unseen dark matter is the leading explanation for why galaxies r
有迹象表明，这可能是第一次被探测到一颗行星在银河系外穿过恒星的迹象 这可能是第一次探测到行星在银河系外穿过恒星的迹象。这个有趣的结果，利用NASA的钱德拉X射线天文台，打开了一个新的窗口，可以在比以往更远的距离搜索系外行星。 这颗可能的候选系外行星位于螺旋星系梅西耶51（M51）中，也因其独特的外形而被称为漩涡星系。 系外行星被定义为太阳系之外的行星。到目前为止，天文学家已经发现了银河系中所有其他已知的系外行星和系外行星候选行星，几乎所有这些行星都距离地球不到3000光年。M51中的一颗系外行星距离我们大约2800万光年，这意味着它的距离是银河系中的行星的数千倍。 系外行星被定义为太阳系之外的
This NASA/ESA Hubble Space Telescope image features two interacting galaxies that are so intertwined, they have a collective name – Arp 91. Their delicate galactic dance takes place more than 100 million light-years from Earth. The two galaxies comprising Arp 91 have their own names: the lower galax
Credits: ESA/Hubble and NASA, A. Nota, C. Britt This comparison of two images shows puffing dust bubbles and an erupting gas shell – the final acts of a monster star’s life. 这两张图片的对比显示了膨胀的尘埃气泡和喷发的气体外壳——这是一颗巨型恒星生命的最后一幕。 These new views showcase the dual nature of the star AG Carinae, which was the ta
在成功完成最后的测试后，可以看到NASA的詹姆斯·韦伯太空望远镜正准备运往发射场。 图片来源：NASA/Chris Gunn NASA计划于2021年12月18日将詹姆斯·韦伯太空望远镜送入轨道，作为未来十年的主要深空观测站。 在韦伯望远镜最近成功完成其严格的测试方案之后，NASA与阿丽亚娜航天公司协调确定了新的发射日期——这是该任务的一个重要转折点。在此之前，阿丽亚娜空间公司于7月下旬成功发射了阿丽亚娜5号火箭，并计划在韦伯望远镜之前发射。今年7月的发射是阿丽亚娜5号自2020年8月以来的首次发射。 韦伯望远镜是NASA与欧空局（European Space Agency）和加拿大航天局合作
In this 30-second exposure, a meteor streaks across the sky during the annual Perseid meteor shower, Wednesday, Aug. 11, 2021, as seen from Spruce Knob, West Virginia. Learn more about the annual Perseid meteor shower. Find out how you can see them in skies across North America! Image Credit: NASA/B
