Earth Day is April 22 and is celebrated across the country, including in Wisconsin, with environmental events, celebrations ...

An unseen planet bigger than Earth is lurking at the far edges of our solar system, according to some astronomers. A powerful new telescope that's about to start up has a really good chance of ...

Dune. Star Wars. Alien. Science fiction movies love alien worlds, and so do we. But how do scientists find planets outside ...

A new trail in this southern Arizona city plots the most visitor-friendly astronomy stops—and there are plenty to choose from ...

What happens if, after all our searching, we don’t find any signs of life on other planets? A group of scientists led by Dr.

As global temperatures rise, scientists debate the pros and cons of solar geoengineering, a strategy to cool Earth by reflecting sunlight into space.

Linda Spilker, the Voyager mission’s project scientist, spoke to Gizmodo about the challenges that come with operating the ...

Jupiter’s skies can glow with lights more intense than anything on Earth. Its polar auroras shine when charged particles ...

April skies feature close planet pairings, a bright meteor shower, and stunning views of the ancient star cluster M3.

Each of the planets, labeled b, c, d, and e, has a mass between 20% and 30% of Earth's, making them among the smallest yet ...

We often focus on space observatories that peer beyond Earth. But the vast majority of satellites stare right back at us.

Scientists are using an array of instruments to detect other planets, some of which may harbor life—and others that most ...