There are 10 primary types of clouds on Earth. Here you can learn about what they're made of, how they form and how they are classified.

The vital ingredients for life on Earth may have been delivered by meteorites from larger bodies called "planetesimals" in ...

Life on Earth and its evolution may have been the result of lightning strikes activating and bringing together natural chemical elements, a new study from Harvard suggests.

How did complex life survive when Earth was frozen over? Scientists say tiny meltwater ponds on ancient ice may have been the ...

For millions of years, Earth was a hot and rocky planet. Scientists have some hypotheses on how life emerged amid such inhospitable terrain.

Scientists know a lot about life on Earth, but most astrobiologists agree that more exotic types of life – perhaps based on different combinations of chemical elements and solvents – are possible. How ...

Strange microbes on Earth might help us understand life on Venus If the clouds of our sister planet contain life, it will be very different than what we know. But terrestrial analogs might still ...

Nearly a hundred different types of amino acids have been observed in meteorites, ... It’s possible that the answer to whether life started on Earth or in space is: both.

Had Earth’s atmosphere been left naked to solar wind for much longer, the planet could have dried out and looked much different than it does now. “The shields couldn’t be down for too long ...