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【Astronomy Picture of the Day】NGC 2440: Cocoon of a New White Dwarf, 2023.12.24
What's that in the center? Like a butterfly, a white dwarf star begins its life by casting off a cocoon of gas that enclosed its former self. In this analogy, however, the Sun would be a caterpillar and the ejected shell of gas would become
【Astronomy Picture of the Day】Geminids over China's Nianhu Lake, 2023.12.17
Where are all of these meteors coming from? In terms of direction on the sky, the pointed answer is the constellation of Gemini. That is why the major meteor shower in December is known as the Geminids -- because shower meteors all appear t