Galaxy contains billions of potentially habitable planets, say Berkeley, Hawaii astronomers
"Astronomers reported that there could be as many as 40 billion habitable Earth-size planets in the galaxy, based on a new analysis of data from NASA’s Kepler spacecraft," The New York Times is reporting, adding, "One out of every five sunlike stars in the galaxy has a planet the size of Earth circling it in the Goldilocks zone — not too hot, not too cold — where surface temperatures should be compatible with liquid water, according to a herculean three-year calculation based on data from the Kepler spacecraft by Erik Petigura, a graduate student at the University of California, Berkeley."
Three other weird things about The New York Times article is that it kept referring to "galaxy," when I think that they really mean "universe." Each time they refer to "galaxy," I could not figure out which "galaxy" within the "universe" they meant. Did anybody figure out which "galaxy" the reporter meant ?
Also, it is not explained why the scientific study cited in the article required that the habitable planets being search had to be approximately the size of our planet, earth ? Wouldn't it not matter what size a planet was, so long as the planet had water, breathable air, sufficient atmospheric pressure, and gravity to make life possible ?
What kind of "life" were astronomers thinking that they would find : life that would identically resemble human life ?
