The United States is stepping back from the most direct test yet of possible alien biology on Mars just as new telescopes and probes are racing ahead to hunt for life light‑years away. Lawmakers have ...

Fuel would be an issue on such a long journey, so the AI-theorized probe would need a solar-electric power system and head ...

Even at this early stage in our spacefaring age, humanity has already begun sending probes that will eventually reach other solar systems, even if that was not their original intention. Five robotic ...

Add Yahoo as a preferred source to see more of our stories on Google. NASA/JPL-Caltech If there are indeed other beings in our galaxy, and they are sophisticated enough to traverse the expanse of ...