保护地球，探索宇宙，发现文明
2023年7月12日 Rings and Bar of Spiral Galaxy NGC 1398 Image Credit: Mark Hanson; Data: Mike Selby Explanation: Why do some spiral galaxies have a ring around the center? Spiral galaxy NGC 1398 not only has a ring of pearly stars, gas and dust around its center, but a bar of stars and gas across its center, and spiral arms that appear like ribbons farther out. T...
2022年2月21日 Barred Spiral Galaxy NGC 6217 Image Credit: NASA, ESA, and the Hubble SM4 ERO Team Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a modest central bar. Prominently barred spiral galaxy NGC 6217, featured here, was captured in spectacular detail in this image taken by the Advanced ...