Tagged: earth

Earth is an exoplanet to aliens: This is what they’d see

The study of exoplanets has matured considerably in the last 10 years. During this time, the majority of the over 4000 exoplanets currently known were discovered. It was also during this time that the process has started to shift from the discovery to characterization. What’s...

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 to sustain liquid water on its surface for such a long time? There is only...

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 iron meteorites reveal that Earth likely gathered its nitrogen not only from the region beyond...

Earth is about to lose its second moon, forever

Earth’s second moon will make a close approach to the planet next week before drifting off into space, never to be seen again. “What second moon,” you ask? Astronomers call it 2020 SO — a small object that dropped into Earth’s orbit about halfway between...