The engineering lesson is simple: Sometimes the best observatory is the one already parked at another planet. When an interstellar comet was in a viewing geometry that kept Earth-based telescopes too ...

CAPE CANAVERAL, Fla. (AP) — Now's the time to catch Mars in the night sky. The red planet is making its closest approach to Earth in 15 years. The two planets will be just 35.8 million miles (57.6 ...

This will occur Friday, and everyone in the world can watch, weather permitting. Earth and Mars align with the sun in opposition about once every two years. But truly jaw-dropping midnight views of ...

For the first time, a fleet of orbiters and a rover circling another world has captured detailed views of an interstellar visitor as it swept through the inner solar system. As comet 3I/ATLAS brushed ...