The United States flew a reactor in space in the 1960s and has studied nuclear thermal propulsion for decades. Fuel is not the primary limitation either; the enriched uranium supply chain is ...

NASA's new moon rocket has suffered another setback, almost certain to bump astronauts' Artemis II lunar mission into April.

Drawing together leading experts from across the field, an international collaboration of cosmologists has created a unified ...

That the universe is expanding has been known for almost a hundred years now, but how fast? The exact rate of that expansion ...

How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think ...

The big bang wasn’t the start of everything, but it has been impossible to see what came before. Now a new kind of cosmology is lifting the veil on the beginning of time ...

A physicist proposes that the universe is not empty space, but is a viscous fluid, fueling the expansion and contraction we see.

Astronomers mapping interstellar dust in three dimensions have identified a giant spherical void in the Milky Way, roughly ...

Schenley Sargusingh gets a flicker in his eye when he talks about his work in the professional film industry. Twenty years ...