Browsing: existence

Arctic: The area within the Arctic Circle, characterized by extreme cold temperatures and snow cover for most of the year. The Arctic Highlands make up the…

The dark region in the upper right corner of this Mars image, the Acidaria Planum, may contain bacteria deep within its rocky surface. NASA/JPL/USGS Certain regions…

Calcium: Chemical element and alkali metal common in Earth’s crustal minerals and sea salts. It is also found in bone minerals and teeth, and plays a…