The New Horizons spacecraft zooms toward an object 4 billion miles from Earth.
Many consider “Earthrise,” to be one of the most important photos of the 20th century.
OSIRIS-REx’s mission to the asteroid has come across some surprising findings that might affect its ability to collect samples to bring back to Earth.
Bacteria, both good and bad, go wherever humans do. Understanding their quirks in outer space is key to preserving astronauts’ health.
Radioactive chemicals, preserved for thousands of years, reveal that a powerful solar storm swept over our planet around 660 BCE.
From its engine to its computer, the Apollo 8 spacecraft—and its mission—marked a revolution in spaceflight.
Craters on Pluto and Charon hint at a surprisingly small number of tiny objects in the Kuiper Belt—which could rework theories on how the planets formed.
There's a reason why so few rockets are designed to come back to their launch sites.