After analyzing data collected by the Kepler Space Telescope, scientists now estimate that nearly every star in our galaxy has at least one planet circling it, the Los Angeles Times reports.
The launch of the James Webb Space Telescope in 2018 will help scientists look for gases in a planet's atmosphere that only could be produced by life.
At a forum of top NASA scientists on Monday in Washington, former astronaut and NASA Administrator Charles Bolden said:
"Do we believe there is life beyond Earth? I would venture to say that most of my colleagues here today say it is improbable that in the limitless vastness of the universe we humans stand alone."