保护地球，探索宇宙，发现文明
2023年10月6日 Edwin Hubble Discovers the Universe Image Credit & Copyright: Courtesy Carnegie Institution for Science Explanation: How big is our universe? This question, among others, was debated by two leading astronomers in 1920 in what has since become known as astronomy’s Great Debate. Many astronomers then believed that our Milky Way Galaxy was...
2020 May 1 A View Toward M106 Image Credit & Copyright: Joonhwa Lee Explanation: Big, bright, beautiful spiral, Messier 106 dominates this cosmic vista. The nearly two degree wide telescopic field of view looks toward the well-trained constellation Canes Venatici, near the handle of the Big Dipper. Also known as NGC 4258, M106 is about 80,000 light-year...
2020 April 30 Andromeda Island Universe Image Credit & Copyright: Yuzhe Xiao Explanation: The most distant object easily visible to the unaided eye is M31, the great Andromeda Galaxy some two and a half million light-years away. But without a telescope, even this immense spiral galaxy – spanning over 200,000 light years – appears as a faint,...