The planets will align in the night sky on Feb. 28. Here is when to look up and which ones are visible without a telescope.

If life ever existed on Mars, it might have looked like microfossils right here on Earth.

The NASA administrator Jared Isaacman tells Ross Douthat how his trips to space shaped his perspective on space travel.

Want to catch a glimpse of the planetary alignment from Arizona? Here's what to know, including a list of official dark sky ...

Astronomy does not belong off Earth. It belongs wherever the universe can be observed — and that necessarily includes the surface of the planet humans live on. Kelsey Johnson: Past President of the ...

It started with a rock that didn’t look like a big deal. Just a dark lump in the Sahara. The kind of thing you could walk ...

In 250 million years, Earth’s continents may merge into a supercontinent so extreme that most mammals would struggle to survive.

A lost cache of 250-million-year-old fossils from Australia has rewritten part of the story of life after Earth’s worst mass extinction. Instead of a single marine amphibian species, researchers ...

Deserts are notoriously dry, so why do so many of them border oceans?

Stargazers of Arizona, keep your eyes skyward on early Saturday evening for a cosmic spectacle. A rare six-planet alignment will occur on Feb. 28 as Mercury, Venus, Saturn, Jupiter, Uranus and Neptune ...