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 ...

The human mind may find it difficult to conceptualize a cosmic cloud so colossal it surrounds the Sun and eight planets as it extends trillions of miles into deep space. The spherical shell known as ...

A hidden structure at the farthest reaches of our solar system is challenging long-held theories. Using advanced simulations, ...

In the farthest reaches of our solar system, beyond the familiar planets and even the icy Kuiper Belt, lies a mysterious ...

These snared worlds could be traded like Pokémon cards with neighboring star Alpha Centauri. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Next ...