A top NASA scientist said that we are not alone in the universe. However, he’s not talking about full-sized aliens you’d imagine flying UFOs through the galaxy just yet.

“We are not talking about little green men,” Ellen Stofan, chief scientist for NASA, said. “We are talking about little microbes.”

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The NASA leader discussed this information over the course of an hour-long presentation. They referenced a study that analyzed the atmosphere above Mars’ polar ice caps. It suggested that 50 percent of the planet’s hemisphere had oceans up to a mile deep. The oceans were thought to be on Mars for up to 1.2 billion years.

“We think that long period of time is necessary for life to get more complex,” Stofan said, stating that getting human field geologists and astrobiologists would greatly improve our knowledge and eventually lead to a physical discovery.