rocky worlds like our own are abundant in our galaxy. — Alien landscapes: 15 places on Earth that look exoplanetary — Planet classification: How to group exoplanets — 10 weird water worlds ...

Their results, published in The Astronomical Journal this week, suggest that an Earth-like planet orbits one in every four sun-like stars. Totaled up, that means there could be up to 10 billion ...

We still don’t have any idea what the planets look like, or if water in any form actually exists on them. Still, filtering out the most likely life-supporting planets is a huge step towards ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

That’s not an exaggeration: Of 10 probes that have made it to the ... But it also happens to be the closest 'Earth-like' planet that researchers know of. Hundreds of planets found outside ...

Now astronomers have detected the ruins of ancient planets around two unusual white dwarf stars, including an Earth-like world that existed almost 10 billion years ago. When most stars ...