Tags: earth

Why is the Earth blue?

Seen from space, the Earth is blue. The Earth has been blue for over 4 billion years because of the liquid water on its surface. How has the Earth managed...

Much of Earth’s nitrogen was locally sourced

Where did Earth’s nitrogen come from? Rice University scientists show one primordial source of the indispensable building block for life was close to home. The isotopic signatures of nitrogen in...

Are we not the only Earth out there?

You stand in a perpetual sunset, beneath an eerie, reddish-orange sky laced with thin clouds. At the edge of a vast sea, solid ground rises slowly from the water, giving...