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Earth Sciences 21 Online
OpenStudy (anonymous):

I'll give medal!!! 1. What was the original reason for identifying and naming nebulas? 2. Are all double stars binary stars? 3. How can astronomers tell if groups of stars actually form a star cluster?

OpenStudy (anonymous):

@SyedMohammed98 are you good with earth science? You're the only active helper on this forum so it would be great if you could help me out.

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