Swarms of comets surround a star in deep space.
2025-11-21 1094词 困难
Some of these comets can get bright enough for us to see without optical aid, but the vast majority of them never become very conspicuous. When they’re out in the deep solar system, beyond the orbit of Neptune, we need gigantic telescopes to see them at all, so feebly do they reflect sunlight.
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