Pumice-like rafts of lightweight material could have carried volcanic debris across an ancient Martian ocean to build one of the most puzzling features on the Red Planet.
Researchers use trial and error to develop a technique to create volcanic lava bombs.
Researchers studying the super-Earth 55 Cancri e spotted some puzzling features that provide a new vision of the orb's surface.
Infrared light from the planet's surface shows hot spots that might be caused by lava.
Newly identified knobby terrain related to ancient volcanoes on Mars hint that pyroclastic ash and rock flowed down slopes early in the red planet's history.