2022年6月13日 M51: The Whirlpool Galaxy from Hubble Image Credit: NASA, ESA, Hubble, HLA; Processing & Copyright: Bernard Miller Explanation: The Whirlpool Galaxy is a classic spiral galaxy. At only 30 million light years distant and fully 60 thousand light years across, M51, also known as NGC 519 […]
2021年01月20日 The Magnetic Field of the Whirlpool Galaxy Image Credit: NASA, SOFIA, HAWC+, Alejandro S. Borlaff; JPL-Caltech, ESA, Hubble; Text: Jayanne English (U. Manitoba) Explanation: Do magnetic fields always flow along spiral arms? Our face-on view of the Whirlpool Galaxy (M51) allows a spectacu
2019 December 31 M33: The Triangulum Galaxy Image Credit & Copyright: Rui Liao Explanation: The small, northern constellation Triangulum harbors this magnificent face-on spiral galaxy, M33. Its popular names include the Pinwheel Galaxy or just the Triangulum Galaxy. M33 is over 50,000 light-yea
2019 August 29 M27: Not a Comet Image Credit & Copyright: Bob Franke Explanation: While hunting for comets in the skies above 18th century France, astronomer Charles Messier diligently kept a list of the things he encountered that were definitely not comets. This is number 27 on his now famous n
不同波长的光能够揭示天体的不同特征。最左边是漩涡星系（Whirlpool galaxy）的可见光图像，第二张结合了可见光和红外光，而右边的两个图像对应不同波长的红外光。 Credits: NASA/JPL-Caltech 加入了NASA斯皮策太空望远镜（Spitzer Space Telescope）的观测，这个星系的不同色调记录了它从可见光到红外光下的外观变化。 漩涡星系（又名Messier 51或NGC 5194/5195）实际上是一对相互作用的星系，它们通过引力互相吸引、拉扯扭曲。它距离我们大约2300万光年，位于猎犬座（Canes Venatici）。 最左边的图像（a）显示了可见光下
