During the early days of our solar system, giant impacts were common occurrences. Earth likely experienced such an impact ...

It's hard to land on Venus to gauge what happens below the surface — so a NASA study is turning toward balloons equipped with seismometers as a test on Earth.

Maybe Venus has not yet nucleated an inner core, so it's missing that extra power source. The fourth possibility, O'Rourke said, is that Venus' core might be chemically stratified.

This high resolution (1 million particles) computer simulation illustrates a 1,800-mile-diameter (3,000-kilometer) projectile striking Venus head-on at 18 miles per second (30km/s). On the left, the ...