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发帖数: 1994 | 1 Hoag's Object: A Strange Ring Galaxy
Credit: R. Lucas (STScI/AURA), Hubble Heritage Team, NASA
Explanation: Is this one galaxy or two? This question came to light in 1950 when
astronomer Art Hoag chanced upon this unusual extragalactic object. On the outside is a ring
dominated by bright blue stars, while near the center lies a ball of much redder stars that are
likely much older. Between the two is a gap that appears almost completely dark. How Hoag's
Object formed remains unknown, alt | s*****t
发帖数: 1994 | 2 Ring Galaxy AM 0644-741 from Hubble
Image Credit: Hubble Heritage Team (AURA / STScI), J. Higdon (Cornell) ESA, NASA
Explanation: How could a galaxy become shaped like a ring? The rim of the blue galaxy pictured on the right is an immense ring-like structure 150,000 light years in diameter composed of newly formed, extremely bright, massive stars. That galaxy, AM
0644-741, is known as a ring galaxy and was caused by an immense galaxy collision. When galaxies collide, they pass through each other |
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