Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

Scientists decode Johannes Kepler’s 417-year-old sunspot drawings, solving a long-standing mystery about solar cycles and the grand solar minimum.

Drawings he made of a sunspot group in 1607, a new study reveals, show the "tail-end of the solar cycle" with instrumentation before the telescope was more widely available in the early 17th century.