天文学家经过观测发现，银河系中至少存在2000亿颗恒星，而宇宙中却存在约两万亿和星系团，人类在宇宙中可能连细菌都算不上！#探索宇宙#天文#银河系
Synopsis
天文学家经过观测发现，银河系中至少存在2000亿颗恒星，而宇宙中却存在约两万亿和星系团，人类在宇宙中可能连细菌都算不上！
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