See stunning photos of Earth taken from space by astronauts and robotic spacecraft, celebrating our home planet on Earth Day.

April 22 is Earth Day. There are numerous ways to participate in Pittsburgh by connecting with nature and advocating for ...

Two readers argue that we’ve overlooked some key information about disc-shaped planets ...

A rare planetary alignment peaks April 20, with Mercury, Mars, and Saturn clustering at dawn. Here’s where travelers should ...

It’s the most iconic image of our planet. Decades before the Artemis II mission, a group of astronauts experienced an Earth ...

The chance to see four planets in the sky at the same time, and so close together, isn't terribly common. Gyuk says that ...

For several days this month, Saturn, Mars, and Mercury appear just degrees apart before sunrise—close enough to watch their ...

EXO's EXO PLANET #6 EXhOrizon in Seoul kicked off on April 10-12, and goes through Asia until July. This is a review of Day 1 ...

Earth’s magnetic field shields our planet from dangerous solar energy and damaging cosmic radiation, while the gravitational ...

NASA astronaut Jessica Meir captured a stunning photo of the Lyrids meteor shower from the International Space Station.

On April 18, Mercury, Mars, Saturn, and Neptune align in the sky, but it might be hard to Tennesseans to spot. Here is what ...

See the crescent Earth shine above the lunar horizon in a newly released Artemis 2 photo, captured as the crew passed the far ...