Water is essential to life, yet its true origin on Earth still stirs debate. Scientists have long wondered whether it came from icy comets, rocky asteroids, or both. Each theory tells a different ...

On March 2, 2004, the European Space Agency launched the Rosetta mission to study Comet 67P. Rosetta would later become the first spacecraft to orbit a comet. It was also the only mission to ...

Comet 67P/Churyumov-Gerasimenko as seen by the European Space Agency’s Rosetta spacecraft in March 2015. Comet 67P was the first comet ever known to emit molecular oxygen, a molecule rarely ...

This image, taken by ESA’s Rosetta navigation camera, was taken from a about 53 miles from the center of Comet 67P/Churyumov-Gerasimenko on March 14, 2015. The image resolution is 24 feet per ...