Comets-spewing-oxygen club gets new member
Like 67P, Halley leaks O2, new analysis of 1986 data shows
![Halley's comet](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/12/121415_cc_halleyscomet_free.jpg?fit=860%2C460&ssl=1)
LONG-TERM LEAK Halley’s comet, seen in this 1986 photograph, might have been leaking oxygen trapped since the formation of the planets, a new study suggest.
W. Liller, NASA