A camera affixed to the International Space Station recently spotted some curious symbols amid a barren desert landscape.

During a brief but dramatic chapter in Earth's history about 41,000 years ago, the planet’s magnetic field nearly collapsed.

Imagine crossing vast oceans, soaring across continents, or tunneling deep beneath the earth—without ever getting lost. For ...

Like Earth, Mars once had a strong magnetic field that shielded its thick atmosphere from the solar wind. But now only the ...