One million alien visitors from another star system could already be lurking in the solar system. We aren't talking about ...

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 ...

Asteroids and comets from Alpha Centauri are lurking on the outer edges of our solar system. There is a record of two ...

"We found that some comets in the inner Oort cloud form a long-lasting spiral structure." Spirals are a repeating theme in ...

Astronomers believe they've discovered a spiral structure inside the Oort cloud that surrounds our solar system.

Mercury, Venus, Mars, Jupiter, Saturn, Neptune and Uranus could be visible, but not all can be seen by the naked eye.

The discovery that helium and iron can mix at the temperatures and pressures found at the center of Earth could settle a long ...

which ebbs and flows as our solar system ambles through the Milky Way. (For objects near the Sun, like planets, the tide's effect is largely overpowered by the star's gravity.) This is what the ...

A stunning planet parade is now visible in the night sky. A planet parade is when several of our solar system's planets are visible in the night sky at the same time. All seven planets will be ...