There's more than just gravity at work in the solar system
Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...
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Kepler's sunspot sketches unravel the 400-year-old solar mystery
Johannes Kepler, a German mathematician born in 1571, is best known for formulating the laws of planetary motion. However, not everyone knows he was also a keen observer of the Sun. In 1607 ...