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

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Skinny” funding prioritizes a focus on Moon and Mars missions over science and projects characterized as “grossly expensive.” ...

There can’t be many more self-indulgent ways to damage our planet than to burn off ... when unable to leave the International Space Station for over nine months. That is what a good scientist ...

From Lowell Observatory in Flagstaff to Mount Lemmon near Tucson, here are the most recommended locations places for ...

In a major announcement that stirred both the tech and space communities, SpaceX CEO Elon Musk has laid out an ambitious plan ...

Arizona is a hub for space exploration ... and planetary alignments. Nestled within a 110-acre nature preserve, the ...

The agency said that key components of the ambitious project, including the Long March 10 heavy-lift carrier rocket, the ...

A crescent of the northern hemisphere of Mars taken by Tianwen-1's medium-resolution camera in March 2021. Credit: CNSA/PEC Join our newsletter to get the latest military space news every Tuesday ...

The preliminary version of President Donald Trump’s budget proposal to Congress, known as a “passback,” would cut the ...