NASA chief scientist: 'Indications' of alien life by 2025

They may not be "Star Trek"-type extraterrestrials, but we may be close to finding evidence of alien life, a NASA scientist says.

"I think we're going to have strong indications of life beyond Earth within a decade, and I think we're going to have definitive evidence within 20 to 30 years," NASA chief scientist Ellen Stofan said Tuesday during a panel discussion on the universe.

"We know where to look. We know how to look," she said. "In most cases, we have the technology, and we're on a path to implementing it. And so I think we're definitely on the road."