Harvard's Avi Loeb warns interstellar comet 3I/ATLAS could be alien tech. Experts weigh in on planetary defence and the risks ...

Mars ended NASA’s InSight mission on its own terms, not with a dramatic crash or a catastrophic malfunction, but with a slow, ...

For decades, Uranus and Neptune have been filed neatly into the “ice giant” drawer, shorthand for worlds built mostly from ...