The irregular shapes and orbits of Mars’s two small moons, Phobos and Deimos, have long been a subject of scientific ...

One summer night in 1877, American astronomer Asaph Hall was looking through his telescope in Washington, D.C. Mars was at its closest point to Earth in its orbit, and Hall had one question on his ...

"The exploration of the moon is going to be a continuous activity." SYDNEY — Leaders of the world's major space agencies shared visions for space in the coming years at a major space congress in ...