Pioneer 10, now 7.5 billion miles (12.10 billion kilometers) from Earth, has been silent since March. Currently, a radio signal traveling at the speed of light takes more than 11 hours to reach ...

Geologists have found that an ancient meteorite hit Scotland 200 million years later than previously thought, which has ...

Most images of the Earth show the Northern Hemisphere of the planet, as this half of the globe is home to 68% of all land.

In December, astronomers identified that the asteroid YR4 had a small but not insignificant chance of striking Earth in 2032, ...

The mission, scheduled for this year, is a significant milestone in the development of space-based solar power systems. If ...