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Articles on Earth

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Sand blown by wind into ripples within Victoria Crater at Meridiani Planum on Mars, as photographed by NASA’s Mars Reconnaissance Orbiter on October 3, 2006. NASA/JPL-Caltech/University of Arizona/Cornell/Ohio State University

What’s it like to be on Venus or Pluto? We studied their sand dunes and found some clues

There are many bodies in the solar system we can’t easily access. But observations of their winds and sediments reveal a surprising amount.
Scientists have been studying lunar samples brought back from Apollo missions to understand the geologic history of the Moon. NASA

Moon lacked a magnetic field for nearly all its history – new research resolves mystery sparked by rocks brought back on Apollo

Without a magnetic field, the Moon’s surface is exposed to solar wind. These could have been depositing resources like water and potential rocket fuel on the Moon’s surface for billions of years.
The planet and the way we live on it are constantly changing. Buena Vista Images via Getty Images

What will the Earth be like in 500 years?

The Earth is constantly changing in natural ways, but most of those changes are very slow. Humans are speeding up other changes with global warming.
Gravity feels like it’s pulling everything toward Earth, but why? AdventurePhoto/E+ via WikimediaCommons

Why does gravity pull us down and not up?

Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.
It can stretch your mind to ponder what’s really out there. Stijn Dijkstra/EyeEm via Getty Images

Does outer space end – or go on forever?

Astronomers know a lot about what’s in outer space – and think it’s possible it never ends.

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