保护地球, 探索宇宙, 发现文明
2022年4月30日 M44: The Beehive Cluster Image Credit & Copyright: Drew Evans Explanation: A mere 600 light-years away, M44 is one of the closest star clusters to our solar system. Also known as the Praesepe or the Beehive cluster its stars are young though, about 600 million years old compared to our Sun’s 4.5 billion years. Based on similar ages and ...
2022年2月18日 Three Clusters in Puppis Image Credit & Copyright: Dave Doctor Explanation: Galactic or open star clusters are young. The swarms of stars are born together near the plane of the Milky Way, but their numbers steadily dwindle as cluster members are ejected by galactic tides and gravitational interactions. Caught in this telescopic frame over th...
2021年11月24日 Pleiades: The Seven Sisters Star Cluster Image Credit & Copyright: Damien Cannane Explanation: Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it as large and clear as this. Perhaps the most famous star cluster on the sky, the bright stars of the Pleiades can be seen without binoculars from even t...
2021年10月8日 The Double Cluster in Perseus Image Credit & Copyright: Jack Groves Explanation: This pretty starfield spans about three full moons (1.5 degrees) across the heroic northern constellation of Perseus. It holds the famous pair of open star clusters, h and Chi Persei. Also cataloged as NGC 869 (top) and NGC 884, both clusters are about 7,000 ligh...
2020年11月18日 A Double Star Cluster in Perseus Image Credit & Copyright: Greg Polanski Explanation: Most star clusters are singularly impressive. Open clusters NGC 869 and NGC 884, however, could be considered doubly impressive. Also known as “h and chi Persei”, this unusual double cluster, shown above, is bright enough to be seen from a dark ...
2020年8月6日 Messier 20 and 21 Image Credit & Copyright: Emanuele Petrilli Explanation: The beautiful Trifid Nebula, also known as Messier 20, is easy to find with a small telescope in the nebula rich constellation Sagittarius. About 5,000 light-years away, the colorful study in cosmic contrasts shares this well-composed, nearly 1 degree wide field with ope...
2019 December 30 Messier 20 and 21 Image Credit & Copyright: Stanislav Volskiy, Chilescope Team Explanation: The beautiful Trifid Nebula, also known as Messier 20, is easy to find with a small telescope in the nebula rich constellation Sagittarius. About 5,000 light-years away, the colorful study in cosmic contrasts shares this well-composed, nearly 1 de...
2019 October 13 A Stellar Jewel Box: Open Cluster NGC 290 Image Credit: NASA, ESA, Hubble; Acknowledgement: E. Olzewski (U. Arizona) Explanation: Jewels don’t shine this bright — only stars do. Like gems in a jewel box, though, the stars of open cluster NGC 290 glitter in a beautiful display of brightness and color. The photogenic cluster, pictur...
2019 August 30 NGC 7129 and NGC 7142 Image Credit & Copyright: Steve Cannistra (StarryWonders) Explanation: This wide-field telescopic image looks toward the constellation Cepheus and an intriguing visual pairing of dusty reflection nebula NGC 7129 (right) and open star cluster NGC 7142. The two appear separated by only half a degree on the sky, but they...