For years, astronomers have been searching for a ninth planet in our solar system ... to his models, to explain the clustering and movement of other objects in the Kuiper belt, Planet 9 would ...

Over millions of years, these objects grew larger, sweeping up material in their orbits and becoming the planets we know today. This model of solar system formation is known as the nebular hypothesis.

A group of comets with unexplained movements presents a quandary “These objects really look like asteroids in the images,” ...

Astronomers assign the "b" label to the first planet in the system, not "a," to avoid possible confusion with the star. K2-18b is a little over 120 light-years from Earth—on a galactic scale ...

Despite clear and growing demand for solar energy in the Keystone State, the political will to meet it has yet to catch up.

A new educational project is set to transform the trails along the Columbia River into a scale model of the solar ... whole system are we going to have one road with all of these planets on ...

Discover why we've given the ZWO Seestar S30 smart telescope nearly top marks in our latest smart telescope review.

Astronomers assign the “b” label to the first planet in the system, not “a,” to avoid possible confusion with the star. K2-18b is a little over 120 light-years from Earth – on a galactic scale ...