Humanity has already flung machines into interstellar space, but sending people is a different problem entirely. The physics ...

The workings of our solar system are roughly the same now as they have been for millions of years. Moons circle their planets, the planets circle the sun, the sun’s magnetic fields and sunspots wax ...

3I/ATLAS captured the world's attention last month as the comet raced past the Earth, but some believed that it could have been an "alien spacecraft" reaching us ...