Black holes — remnants of collapsed stars — have immense mass that curves spacetime so all paths lead inward. They also ...

Astrophysicists are mapping a vast, hidden structure in space that appears to guide matter and radiation along a kind of ...

A supermassive black hole appears to have been kicked out of its home galaxy and is racing through intergalactic space, ...

If you're going to Mars you'd best take along a jar of anti-aging cream because while you're there you're going to age faster than on Earth thanks to the Theory of Relativity. It's only 477 millionths ...

Weather permitting, SpaceX Falcon 9 may be visible in the sky beyond Cape Canaveral, Florida, after liftoff. Early morning and nighttime launches can offer unique photo opportunities as the rocket ...

Clocks on Mars tick faster by about 477 microseconds each Earth day, a new study suggests. This difference is significantly more than that for our moon, posing potential challenges for future crewed ...

Astronauts Tom Stafford (left) and Wally Schirra (right) demonstrating with two model space crafts during an interview in the 1960s Donald Uhrbrock / Getty Images On December 15, 1965, NASA’s mission ...

Blue Origin is targeting Dec. 18 for its NS-37 suborbital launch, which will fly a wheelchair user to space for the first time ever. Whether you're a casual fan or a spaceflight enthusiast, see how ...