Gagarin's success made him an international hero and a symbol of the Soviet Union's achievements in space exploration.

Learn about Explorer 1, the first U.S. satellite launched in 1958, its impact on space science, pivotal discoveries like the ...

President Donald Trump likes to project dominance and confidence on the world stage, but lately he's been expressing more ...

The Earth stands alone in the solar system as a habitable world, as far as we know. But that doesn’t mean we don’t get visitors, most often in the form of (usually harmless) asteroids. Some even ...

On Sept. 23, a spacecraft will launch with a clear mission — to keep a constant watch on the sun to help protect Earth from space weather. The satellite, Space Weather Follow-On L1 (SWFO-L1), is ...