Oxygen leaking from comet surprises astronomers
Rosetta detects O2 molecules, probably from solar system’s birth, on 67P
![rosetta](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/10/102815_cc_rosetta_free.jpg?fit=860%2C460&ssl=1)
SPACE SURPRISE Some of the gas streaming from comet 67P, seen in this September 11 picture from Rosetta, contains oxygen molecules trapped since the beginning of the solar system.
NAVCAM/Rosetta/ESA (CC BY-SA IGO 3.0)