保护地球，探索宇宙，发现文明
This Hubble Space Telescope image captures a portion of the reflection nebula IC 2631, which contains a protostar, the hot, dense core of a forming star that is accumulating gas and dust. Eventually, the protostar may gravitationally gather enough matter to begin nuclear fusion and emit its own energy and starlight. 这张哈勃太空望远镜拍摄的图像捕捉到了反射星云IC2631的一部分，其中包含一颗原恒星...
This stunning image captures a small region on the edge of the inky Coalsack Nebula, or Caldwell 99. Caldwell 99 is a dark nebula — a dense cloud of interstellar dust that completely blocks out visible wavelengths of light from objects behind it. The object at the center of the image is a (much smaller) protoplanetary nebula. The protoplanetary nebula phase ...
Nebula [ neb-yuh-luh ]: star-forming cloud of gas and dust. Noun, plural neb·u·lae [neb-yuh-lee, -lahy] 星云:由气体和尘埃组成的恒星形成云。名词，复数neb·u·lae [neb-yuh-lee， -lahy] These four nebulae are known for their breathtaking beauty: the Eagle Nebula (which contains the Pillars of Creation), the Omega Nebula, the Trifid Nebula, and the Lagoon Nebula. In the 1950s, a team of...
NGC 6891 is a bright, asymmetrical planetary nebula in the constellation Delphinus, the Dolphin. This Hubble image reveals a wealth of structure, including a spherical outer halo that is expanding faster than the inner nebula, and at least two ellipsoidal shells that are orientated differently. The image also reveals filaments and knots in the nebula’s inter...
Mounded, luminous clouds of gas and dust glow in this Hubble image of a Herbig-Haro object known as HH 45. Herbig-Haro objects are a rarely seen type of nebula that occurs when hot gas ejected by a newborn star collides with the gas and dust around it at hundreds of miles per second, creating bright shock waves. In this image, blue indicates ionized oxygen (...
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 dark, dusty heart of the nebula, where a star cluster reside...
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 Hubble infrared image captures a protostar designated J16728...
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. Many round or nearly round planetary nebulae display these ha...
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。超级气泡周围大约 5 点钟方向的深蓝色区域是星云中最热的区域之一，也是恒星形成最强烈的区域。 N44是一个发射星云，这意味着它的...
Known as NGC 6523 or the Lagoon Nebula, Messier 8 is a giant cloud of gas and dust where stars are born. At about 4,000 light years from Earth, Messier 8 provides astronomers an excellent opportunity to study the properties of very young stars. Many infant stars give off copious amounts of high-energy light including X-rays, which are seen in the Chandra dat...