- Astronomers explain why Mars appears to be moving backward https://www.livescience.com/63059-mars-retrograde-explainer.html 3 comments space
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- Slowing of Earth's Spin Revealed in Ancient Astronomers' Tablets | Live Science http://www.livescience.com/57118-earth-spin-slowdown-shown-in-ancient-tablets.html 31 comments
- How fast does the Earth move? | Live Science https://www.livescience.com/how-fast-does-earth-move.html 6 comments
- Live Science: The Most Interesting Articles, Mysteries & Discoveries http://www.livescience.com/ 1 comment
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