心灵与灵魂星云 The Heart and Soul Nebulas
Image Credit & Copyright: [email protected]' rel='external nofollow noopener noreferrer' target='_blank' class='link-external'>Mario Zauner
Explanation: Is the heart and soul of our Galaxy located in Cassiopeia ? Possibly not, but that is where two bright emission nebulas nicknamed Heart and Soul can be found. The Heart Nebula , officially dubbed IC 1805 and visible in the featured image on the bottom right, has a shape reminiscent of a classical heart symbol . The Soul Nebula is officially designated IC 1871 and is visible on the upper left. Both nebulas shine brightly in the red light of energized hydrogen . Also shown in this three-color montage is light emitted from sulfur , shown in yellow, and oxygen , shown in blue. Several young open clusters of stars are visible near the nebula centers. Light takes about 6,000 years to reach us from these nebulas , which together span roughly 300 light years . Studies of stars and clusters like those found in the Heart and Soul Nebulas have focused on how massive stars form and how they affect their environment .
在阿尔卑斯山上看流星与银河 Meteor and Milky Way over the Alps
Explanation: Now this was a view with a thrill. From Mount Tschirgant in the Alps , you can see not only nearby towns and distant Tyrol ean peaks, but also, weather permitting, stars, nebulas, and the band of the Milky Way Galaxy . What made the arduous climb worthwhile this night, though, was another peak -- the peak of the 2018 Perseids Meteor Shower . As hoped, dispersing clouds allowed a picturesque sky-gazing session that included many faint meteors, all while a carefully positioned camera took a series of exposures. Suddenly, a thrilling meteor -- bright and colorful -- slashed down right next the nearly vertical band of the Milky Way . As luck would have it, the camera caught it too. Therefore, a new image in the series was quickly taken with one of the sky-gazers posing on the nearby peak. Later, all of the images were digitally combined .
X射线波段下看到的第谷超新星遗迹 Tycho's Supernova Remnant in X-ray
Explanation: What star created this huge puffball? What's pictured is the hot expanding nebula of Tycho's supernova remnant , the result of a stellar explosion first recorded over 400 years ago by the famous astronomer Tycho Brahe . The featured image is a composite of three X-ray colors taken by the orbiting Chandra X-ray Observatory . The expanding gas cloud is extremely hot, while slightly different expansion speeds have given the cloud a puffy appearance. Although the star that created SN 1572 , is likely completely gone, a star dubbed Tycho G , too dim to be discerned here , is thought to be a companion. Finding progenitor remnants of Tycho's supernova is particularly important because the supernova is of Type Ia, an important rung in the distance ladder that calibrates the scale of the visible universe. The peak brightness of Type Ia supernovas is thought to be well understood, making them quite valuable in exploring the relationship between faintness and farness in the distant universe.
疑是银河落九天 Milky Way Falls
Explanation: It can be the driest place on planet Earth, but water still flows in Chile's Atacama desert, high in the mountains. After discovering this small creek with running water, the photographer returned to the site to watch the Milky Way rise in the dark southern skies, calculating the moment when Milky Way and precious flowing water would meet. In the panoramic night skyscape, stars and nebulae immersed in the glow along the Milky Way itself also shared that moment with the Milky Way's satellite galaxies the Large and Small Magellanic clouds above the horizon at the right. Bright star Beta Centauri is poised at the very top of the waterfall. Above it lies the dark expanse of the Coalsack nebula and the stars of the Southern Cross.
NASA的APOD （NASA's Astronomy Picture of the Day）每天都会更新一张好看的天文图片，这个帖子就用来放APOD图片吧~
Astronomy Picture of the Day
红外波段看到的草帽星系 The Sombrero Galaxy in Infrared
WISE卫星拍摄到的红外波段的猎户座星云 The Orion Nebula in Infrared from WISE
天涯和海角 Ultima and Thule
旋转的『天涯海角』的动图 Ultima Thule Rotation Gif
月球背面的『玉兔2号』 Yutu 2 on the Farside
射向银河中心的激光 A Laser Strike at the Galactic Center
金牛座方向的恒星、流星和彗星 Stars, Meteors, and a Comet in Taurus
船帆座超新星遗迹 Vela Supernova Remnant Mosaic
北京看到的日偏食 Partial Eclipse over Beijing