Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Loki Patera is 202 kilometres (126 mi) in diameter, covers 20,000 sq km (7,700 sq mi), and was the largest volcanic feature found on Io until these new observations revealed the hot spot in the south ...

Six of the solar system's planets - Mars, Venus, Jupiter, Saturn, Uranus and Neptune - will align on Tuesday night in a ...