Curiosity : No life on Mars yet

The Mars Curiosity Rover killed a week's worth of excitement and speculation with one tweet :

"Everybody, chill. After careful analysis, there are no Martian organics in recent samples."

The tweet, sent out around 1:30 Central time Thursday, deflated a lot of hopes over a scheduled news conference next week in San Francisco. John Grotzinger, the rover mission's principal investigator, told NPR that the team had found something incredible last week. "This data is gonna be one for the history books," he was quoted as saying.

Science geeks around the world believed Grotzinger was hinting at a organic material discovery. However, today's tweets - and a press release from NASA - put an end to that talk.  "Rumors and speculation that there are major new findings from the mission at this early stage are incorrect..." NASA said. "At this point in the mission, the instruments on the rover have not detected any definitive evidence of Martian organics. "

But, the Rover was quick to follow up the disappointing tweet with a hopeful message : "Turn that frown upside down: We're fewer than four months into a multi-year mission. We've only just begun!"