The early-17th-century astronomer Johannes Kepler defined the basic rules governing planetary motion. The basis for everything we understand about the orbits of the planets comes from the work of ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. German astronomer ...

More information: Hisashi Hayakawa et al, Analyses of Johannes Kepler's Sunspot Drawings in 1607: A Revised Scenario for the Solar Cycles in the Early 17th Century, The Astrophysical Journal ...

Many of us old-timers are enduring a fantastic amount of change these days — music, dress codes, Bible study methods, vocal ...

This was Johannes Kepler, who was then about twenty-eight years old. View Full Article in Timesmachine » Advertisement ...

Kepler's sun drawings are the oldest sunspot records with known dates. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. "Half-forgotten ...

Kepler's Supernova, seen in 1604, is one of the most famous exploding stars ever seen, and now astronomers think it may have been an interloper from another galaxy ...

In 1604, Kepler’s Star was the last supernova in our galaxy visible to the naked eye. Tycho’s Star, another Milky Way supernova, was in 1572, only 32 years earlier. Despite its name, Johannes ...

Using modern techniques, researchers have re-examined Johannes Kepler's half-forgotten sunspot drawings and revealed previously hidden information about the solar cycles before the grand solar ...