Did a rogue planet reshape our solar system?

The giant planets weren’t always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact configuration and later underwent a violent reshuffling that scattered them to their current positions. Exactly what triggered this chaos...

Measuring radio leaks from 36,000 kilometers up

Radio astronomy has a pollution problem. Satellites thousands of kilometers overhead, designed to broadcast communications or relay data, are increasingly contaminating the frequencies astronomers use to study the universe. While much attention has focused on...