The object dubbed Earth's "second moon" is actually a quasi-satellite that's accompanied the planet since 1957 — not a true ...

NASA has revealed a terrifying glimpse into our solar system's grizzly fate. In five billion years, scientists believe the ...

NASA Solar Dynamics Observatory (SDO) captured an enormous coronal hole the sun. Credit: NASA / SDO and the AIA, EVE, and HMI ...

Skygazers who look up at the moon tonight may be able to spot Saturn below it. Here's when and how to spot the conjunction.

Twenty-five names are carved into the black mirror-finished granite: the Challenger seven, the seven who perished in the ...

Skygazers who look up at the moon tonight may be able to spot Saturn below it. Here's when and how to spot the conjunction in ...

Here's how to see the celestial pairing.

We know what will happen to the Sun and our Solar System because we can look outward into the galaxy and examine older Sun-like stars in their evolutionary end states.

Watch footage of the Sun unleashing an X1.2-class solar flare. NASA's Solar Dynamics Observatory captured the fireworks in ...

NASA Solar Dynamics Observatory captured a M7.9-class solar flare. See footage of the blast in multiple wavelengths. Credit: ...

Pointing problem left TESS in the dark Good news for planet hunters – NASA's Transiting Exoplanet Survey Satellite (TESS) is ...

Networks created to measure quakes deep underground could also track old, potentially dangerous satellites burning up in the ...