The northern-sky constellation of Gemini is one of the original constellations listed by Ptolemy in the second century, as well as one of the 12 zodiac constellations. The word "gemini" means twins in ...
Star Walk Kids is a version of the astronomy apps Star Walk and Star Walk 2 - the latter of which TUAW's own Mel Martin called "impressively good looking" - designed specifically for educating kids ...
Perseus is one of Ptolemy's ancient constellations. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Perseus is the 24th largest constellation in ...
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