We typically think of the Oort cloud as scattered ice balls floating far from the sun, yet still tied to it gravitationally.

In 1974, science fiction author Larry Niven wrote a murder mystery with an interesting premise: Could you kill a man with a tiny black hole? I won't spoil the story, though I'm willing to bet most ...

Artist's concept of light flares along Sag A*'s accretion disk. (Credit: NASA, ESA, CSA, Ralf Crawford (STScI)) ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto ...

The Orion Nebula is one of the best “must-see” attractions in the sky, and it’s even more impressive once you get to know ...

Data from the Esa Euclid telescope enable precise analysis of an Einstein ring around the galaxy core of NGC 6505 and thus the surrounding dark ...

A galaxy cluster once thought to be “dead” is unexpectedly forming stars at an astonishing rate, challenging established ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary status.

And one of those moons, known as Charon, is half the size of Pluto itself. But that’s not the only thing that’s unusual about ...

This NASA/ESA Hubble Space Telescope image depicts the cosmic tangle that is MCG+05-31-045, a pair of interacting galaxies located 390 million light-years away. UGC 1810 and UGC 1813 are spiral ...

Could our solar system have been temporarily exposed to an enhanced flux of cosmic-rays at some point in the ancient past?