Updated measurements from NASA’s Juno spacecraft could help researchers better understand the planet's mysterious interior, ...

The curious minds at What If imagine a second Earth hiding in our solar system, exploring how it could exist and its effects ...

Twin siblings, twin peaks, twin cities, twin planets... Two earths, one solar system. How would that work?

Close to the sun, the solar wind, a steady stream of charged particles, accelerates until it cannot turn back. During a record pass about 3.8 million miles above the surface, Parker Solar Probe ...

A strong solar flare peaked just after 9 a.m. Tuesday. What does that mean?

The similarities are astonishing. And yet... The post NASA Telescope Discovers Nearby Planet With Deep Similarities to Earth ...

Close-up observations of the Sun explain how solar flares start, grow, and send high-energy particles racing through space.

Auroras are not just on Earth. NASA has detected glowing northern and southern lights on Jupiter, Saturn, Mars and other ...

This hyperbolic Oort Cloud comet, on an inbound journey spanning millions of years, reached perihelion, closest position to ...

Exploring Earth's deep interior is a far bigger challenge than exploring the solar system. While we have traveled 25 billion ...

Low-Earth orbit is more crowded—and fragile—than it looks. Satellites constantly weave past each other, burning fuel and ...

Astronomers have announced the discovery of what appears to be an "ice cold Earth," a chilly but potentially habitable rocky ...