This new measurement suggests some comets — particularly those such as 12P/Pons-Brooks — could indeed have delivered water, and possibly other life-essential elements, to a young Earth.

The rate of human-produced light is increasing in the night sky by as much as 10% per year, making it difficult for astronomers to study the night sky.

Together, DART and Hera lay the foundations for future planetary protection missions. Focusing on asteroids that could pose harm to our planet, these missions require planning and execution at short ...