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Live Science52 分钟
Celestron NexStar 8SE cheapest since January for Prime Day
The Celestron NexStar 8SE is the cheapest we've seen it since January — this deal is one to watch during Prime Day.
Astronomy on MSN1 小时
How did Edwin Hubble prove Andromeda was a galaxy?
How did a Cepheid variable star help Edwin Hubble prove the Andromeda Nebula was a galaxy? Roger BradySan Quentin, California ...