

The presumption that we are not alone
I suppose most people have heard “It Ain’t Necessarily So,” sung by the drug dealer Sportin’ Life in George Gershwin’s Porgy and Bess. The song voices doubts about certain passages in the Bible. But the title phrase is applicable to a range of assumptions well beyond that.
It is, for example, widely assumed that Earth cannot possibly be the only life-bearing planet in the universe, given how vast the universe is and how many planets there must be. In fact, of 2,326 planets so far spotted by NASA’s Kepler space telescope, 10 are said to be about the size of Earth and orbiting their suns in what is called a “habitable zone.” Kepler-22b in particular looks promising. Temperature there seems to be around 72 degrees and it circles a star much like our sun.
I don’t really get emotionally engaged by this. It’s fascinating either way. [Read more →]









