What at first seemed a routine detection of an object travelling through the solar system soon turned out to be anything but.

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new ...

Using gravitational microlensing, scientists have discovered a rare, large planet at the edge of the Milky Way. The planet is ...

Astronomers have discovered six planets orbiting a bright, nearby star in perfect synchrony like a grand cosmic orchestra. The rare find can help explain how solar systems across the Milky Way ...

Our solar system may have a ninth planet after all, ... Several planets found orbiting star less than 6 light-years away. ... Binary star system found near the Milky Way's black hole: ...

Scientists believe the Milky Way contains up to 400 billion stars and at least as many planets. The largest galaxy known, IC 1101, has more than 100 trillion stars. Step outside on a clear night and ...

For only the third time in history, astronomers have detected a new interstellar visitor — an object from another star — blitzing into our solar system.

Our solar system has eight major planets and has been around for more than four billion ... our solar system’s 4.6-billion-year history offers a long time for shedding worlds into the Milky Way.

Over the past decade or so, astronomers have speculated about the characteristics of rogue planets in the Milky Way galaxy. These "free-floating" worlds don't orbit stars, but instead roam the ...

Scientists have unlocked one of the solar system's many secrets from an unexpected source: a planetarium show.