New Ways To Explore The Universe

Early studies focused on water to determine if the planet can sustain life. Now they have finally realized that water is just one small indication of life, and exoplanets can have plenty of other forms of life, without H2O.

Similarly the definition of alien life can be an extraterrestrial being, or even bacteria. The earlier studies which only focused on earth-like planets and stable solar systems due to a better chance of finding habitable zones, have now broadened their vision.