US space agency astrophysicist Thomas Zurbachen told the US Congress the search for ETs is making “remarkable progress”.
Speaking to the US House of Representatives, he said a “growing number of NASA missions” are bringing scientists closer to finding “definitive signs of life”.
He said the latest NASA mission showed that a moon circling Saturn could potentially host aquatic alien life.
Hydrothermal reactions are taking place below the icy surface of the moon, named Enceladus, research found.
This process is crucial for life to thrive.