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Stories, updates, insights, and original analysis from The Planetary Society.

How old is the Earth?

The Earth is thought to be about 4.54 billion years old. Learn more about how it formed, and how we know when this all happened.

See for yourself

See the month’s coolest space pictures, see planets in the night sky, and create the future in space that you want to see.

Moonstruck

Exploring humanity’s long relationship with the Moon.

A lunar saga

How the origins of the Moon could shape the future of human space exploration.

Storms and showers

Mars has storms of dust, while Saturn pours down ammonia rain. Here on Earth, we passed through a debris tail to get a special kind of shower.

Hasta la vista, baby

Terminators abound this week in space, and we’ll be back to Mars if NASA gets the budget it needs.

That’s a mare

An unusual lunar feature, Saturn’s shining rings, and Mars’ complex gullies.

Way out there

We’re always learning more about the worlds of the outer Solar System, and even those beyond.

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