Earth & Space
2 breaks
Planets, weather, oceans and the sky above them.
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Earth is closest to the Sun in January. So why is that winter?
Summer can't be caused by being closer to the Sun: Earth makes its closest pass around 3 January and is farthest around 4 July. The distance changes by only…
Why Mars sometimes walks backwards across the sky
Every 26 months or so, Mars slows down, stops, and drifts backwards against the stars for a couple of months before carrying on. Ancient astronomers built…