If life exists elsewhere, it might not be on worlds like Earth. Here are some of the more peculiar places scientists are looking.

Aliens have long been a staple of science fiction. Yet the possibility of intelligent life beyond Earth is more than a matter of imagination—it is also a subject of serious scientific inquiry.

Searching for alien signals sounds like a question of which star to aim a telescope at. It’s also a question of when to listen, because a civilization sending a focused radio beam toward Earth might ...

Everyone has probably looked up at the night sky and wondered, 'Is there someone out there somewhere in this universe?' It's ...

Astronomers have catalogued more than 6,000 planets beyond our solar system. None has settled the question that matters: is ...

According to a study performed by U.S. and Spanish astronomers, alien astronomers could "hypothetically" identify Earth as a planet orbiting the Sun and observe our planet with clouds and oceans-just ...

Habitable, Earth-like planets can form even after giant planets have barrelled through their birthplace on epic migrations towards their host stars, new computer simulations suggest. The finding ...

What would our atmosphere look like if there were no life on Earth?

The green colour of Earth's forests is not accidental. Plants contain chlorophyll, a pigment that absorbs red and blue wavelengths of sunlight while reflecting green light. This process allows plants ...