The discovery that helium and iron can mix at the temperatures and pressures found at the center of Earth could settle a long-standing debate over how our planet formed.

One million alien visitors from another star system could already be lurking in the solar system. We aren't talking about "little green men" here, however — more "little (and not so little) gray rocks," asteroids from the triple star system Alpha Centauri.

Interstellar material has been discovered in our solar system, but researchers continue to hunt for where it came from and how it got here. A new study led by Western astrophysicists Cole Gregg and Paul Wiegert recommends Alpha Centauri—the next closest solar system to ours—is a great place to start,

Millions of years ago, our Solar System traveled through a densely populated galactic region and was exposed to increased interstellar dust.

The stars as seen from Earth would have looked dimmer 14 million years ago, as the solar system was in the middle of passing through clouds of dust and gas

Researchers claim that there could be at least 1 million interstellar objects hiding in the Oort Cloud at the edge of our solar system.

Using a NASA supercomputer to run models, researchers led by SwRI astronomer David Nesvorny now believe that the Inner Oort cloud looks like a spiral disk, around 0.24 light-years across, with two arms like many a galaxy, albeit oriented vertically.

In research highlighted in a new paper, published today in The Astrophysical Journal, Scientia Senior Lecturer Ben Montet and PhD candidate Brendan McKee analysed changes in the timing of a known planet's transit across its star, to infer the presence of a second exoplanet.

The Oort cloud is a shell of icy objects that forms the very outskirts of our Solar System. Recently, a group of researchers discovered that the inner portion of the Oort cloud likely has spiral arms that make it look like a galaxy.