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 ...

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

Astronomers have announced the discovery of a new dwarf planet in our solar system, named 2017 OF201. Located far beyond ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

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 ...

Gravity is the force that governs the structure and motion of the solar system, keeping celestial bodies together in a cosmic dance. The sun, with its immense mass, generates the strongest ...

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 ...

Tianwen, which means "questions to heaven," is the name given to China's program of robotic Solar System exploration. Tianwen ...

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

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 ...