Siraj’s Planet Y search started about a year ago when he was trying to find out whether the shape of the Kuiper Belt is flat. “The planets of the solar system have slight tilts up and down, but ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

What's special about Chiron's rings is that they're still forming; this marks the first time astronomers have ever seen a ...

Astronomers have been actively hunting for a ninth planet in the solar system for almost a decade. But a new study has suggested there may be another hidden world waiting to be found. | Credit: ...

On August 24, 2006, our solar system lost a planet. It wasn't by cataclysmic destruction, but rather by the vote of the International Astronomical Union, which declared that Pluto, considered the ...

The workings of our solar system are roughly the same now as they have been for millions of years. Moons circle their planets, the planets circle the sun, the sun’s magnetic fields and sunspots wax ...

Life on a planet ruled by two suns might be a little complicated. Two sunrises, two sunsets. Twice the radiation field. In a paper published in Astronomy and Astrophysics, astronomer Joel Kastner and ...

While its star projector leaves a lot to be desired, the Science Can Solar System Planetary Projector is a fantastic educational tool for kids, with its solar system model, complete with talking ...

From lava worlds to gas giants, NASA says the variety of these worlds is staggering—and that signs of a further 8,000 distant ...

LONDON — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper's authors have ...