The ninth planet could be found in only two years, one expert said.

All of the objects in our solar system are acted upon by forces. Forces are pushes or pulls. Every force has both a strength and a direction. Applying a force on something–like pushing a toy car–can ...

A new member of the solar system has been detected, the second-largest of its kind, suggesting there may be more like it ...

The object’s aphelion – the farthest point on the orbit from the Sun – is more than 1,600 times that of the Earth’s orbit,” said Sihao Cheng of the Institute for Advanced Study, discussing the ...

But returning to our main question, the short answer is that the sun does indeed shift position within the solar system, albeit by a tiny amount. That limited oscillating motion or "wobble ...

Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...

Our solar system may have a ninth planet after all ... Two deep infrared surveys taken 23 years apart measured the object's orbital motion. In 1983, the Infrared Astronomy Satellite surveyed ...

The solar system is a busy place ... Monitoring future data from Mars can allow us to notice a change in its motion within a few years if we’re lucky, and then it might be possible ...

the point at which molecular motion stops. But this temperature is not constant throughout the solar system. So-called "empty" space — though it is not actually empty — is far colder than ...

So, when comets outgas, they have what planetary scientists call nongravitational acceleration—motion that isn't caused by the gravity of objects in the solar system. Planetary scientists ...