A grainy thermal clip of a sharply defined triangle gliding over the Nevada desert has reignited one of America’s most ...

Dark matter seems invisible, but it makes up most matter, and we have evidence that it gives the cosmos its shape. Now ...

The huge 1,600-mile (2,500-kilometer) wide expanse of the South Pole–Aitken Basin extends considerably onto the far side of ...

In Pluribus, the frontier isn’t space but Earth, raising the question of whether humanity has earned the right to boldly ...