For four decades, many SETI experiments have focused on finding sharp spikes in frequency but the new study says signals may not stay narrow as they travel away from their home system.

All things that go up must eventually come down. NASA says that its Van Allen Probe A satellite has fallen precipitously back to Earth after a 14-year journey through space. The probe reentered the ...

A startup called Reflect Orbital wants to send thousands of mirrors up into space to bounce sunlight to the dark side of the planet. NBC News’ Tom Costello speaks to the CEO Ben Nowack on how he plans ...

With the first images from the spacecraft now in hand, the team behind NASA's Star-Planet Activity Research CubeSat, or SPARCS, is ready to begin charting the energetic lives of the galaxy's most ...

Comet 3I/ATLAS, the third known interstellar object ever detected passing through our solar system, carries a chemical signature that does not match what astronomers typically see in comets born ...

The comet formed in a cold and distant part of the early Milky Way up to 12 billion years ago, putting it just under 2 billion years the age of the universe.

A Nasa spacecraft weighing more than 600kg has crash landed back to Earth, almost 14 years after it was launched. The Van Allen Probe A, which was launched in a pair in 2012, re-entered Earth's ...

Its twin, the Van Allen Probe B, is still orbiting Earth, but no longer functioning. Launched in 2012, the two spacecraft flew through the Van Allen radiation belts that surround Earth, studying them ...

A long-retired NASA satellite has finally returned to Earth, burning through the atmosphere before falling into the Pacific.

An old NASA science satellite plunged uncontrolled from orbit and reentered over the Pacific on Wednesday. The U.S. Space Force said the Van Allen Probe A came in west of the Galapagos Islands.

In a contemporary Hollywood that often treats alien contact as catastrophe, “Project Hail Mary” fuses intergalactic bonds to ...