Mars, often depicted as a barren red planet, is far from lifeless. With its thin atmosphere and dusty surface, it is an ...

NASA’s James Webb Space Telescope has turned up a tiny set of galaxies in the early universe that look deceptively simple but ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

Solar physicists say they have found a key source of intense gamma rays unleashed when Earth's nearest star produces its most ...