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

Is the Moon shrinking?

The Moon is shrinking in both actual volume and its apparent size from Earth’s perspective. We explain how scientists know this, why it happens, and how it might affect Earth.

Sharing an eclipse with kids

Here's a simple and safe way to observe solar eclipses that's appropriate for young children, with no eclipse glasses or other special equipment needed.

How did Earth get its water?

Earth's water may have been on our planet since its formation, or could have been brought here by impactors early in our planet's history. Here's a look at the leading theories about where Earth's water came from.

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.

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