Wow. News from NASA:
The space boffins have found a bacterium living in an arsenic lake near California's Yosemite National Park.
The finding is important because the bacterium uses arsenic in place of phosphorus - an element previously considered vital for all forms of life.
If there can be life without phosphorus then there are thousands more planets which could sustain life of some sort.
And Keck Observatory:
It's a cosmic embarrassment of riches