In a measurement taken Wednesday, Nasa’s Curiosity rover discovered startlingly high amounts of methane in the Martian air, a gas that on Earth is usually produced by living things. The data arrived back on Earth on Thursday, and by Friday, scientists working on the mission were excitedly discussing the news.

from Times of India https://timesofindia.indiatimes.com/home/science/nasa-rover-on-mars-detects-puff-of-gas-that-hints-at-possibility-of-life/articleshow/69917830.cms