It really could happen in our lifetimes! If you've been excited about the idea of meeting beings from another planet since your first "Star Trek" episode, this is a story you have got to read. The top NASA scientist is predicting we'll discover alien life in the next 10 to 20 years.
It's estimated that there are at least 200 billion Earth-like planets in our galaxy, and scientists are confident that it's a matter of when, not if, we will encounter alien life forms. It's been recently discovered that Ganymede, one of Jupiter's moons, has a "saltwater, sub-surface ocean, likely sandwiched between two layers of ice" that's been observed using the Hubble Space Telescope.
Even Mars, the red planet, has been studied enough to discover that 50% of the Martian northern hemisphere once had oceans a mile deep. Jim Green, NASA's director of planetary science, noted that the same study found that water had been on the planet's surface for at least 1.2 billion years.
'I believe we are going to have strong indications of life beyond Earth in the next decade and definitive evidence in the next 10 to 20 years,' Ellen Stofan, chief scientist for NASA, said. 'We know where to look, we know how to look, and in most cases we have the technology.'