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Articles on Earth

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Artist’s rendition of NASA’s 2020 Mars rover collecting rocks with its robotic arm. NASA

Meteorites from Mars contain clues about the red planet’s geology

Martian meteorites allow scientists here on Earth to decode that planet's geology, more than a decade before the first missions are scheduled to bring rocks back home from Mars.
In 2015, NASA’s New Horizons spacecraft looked back toward the sun and captured this near-sunset view of the rugged, icy mountains and flat ice plains extending to Pluto’s horizon. NASA/JHUAPL/SwRI

Planetary confusion – why astronomers keep changing what it means to be a planet

Many people are still upset that Pluto was demoted from being a planet. But definitions of various celestial objects are fairly fluid. So whether it is an asteroid or moon or planet is up for debate.
The view of our planet from aboard the International Space Station. Expedition 43/NASA

Curious Kids: What is the Earth made of?

Of all the planets in the solar system, there’s a reason we call Earth home. It’s made of just the right stuff. It’s not too small, or too big, or too hot or too cold. It’s just right.
On June 5-6, 2012, NASA’s Solar Dynamics Observatory collected images of one of the rarest predictable solar events: the transit of Venus across the face of the Sun. NASA/SDO, AIA

Why we need to get back to Venus

This hot, acidic neighbor with its surface veiled in thick clouds hasn't benefited from the attention showered on Mars and the Moon. But Venus may offer insights into the fate of the Earth.
Earth is really ancient, and humans have only been around for a tiny part of that time. NASA

Curious Kids: how was the Earth made?

All the buildings and the cars and the restaurants, and the phones and even everything that's inside of you... it all started with an exploding star, billions of years ago.

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