I don't think anybody is saying that. The point is that there is a vanishingly small possibility of a 'nirvana' planet that has no predators.
Scientific American had an article a year or so ago about a 'super earth' that would be a better planet than earth for mankind and what that might look like.
An
exoplanet (extrasolar planet) is a
planet located outside the
Solar System. The first confirmed detection of exoplanets was announced in 1992, with two planets found orbiting a
pulsar. The first confirmation of an exoplanet orbiting a
main-sequence star was made in 1995, when a giant planet was found in a four-day orbit around the nearby star
51 Pegasi. Some exoplanets have been
imaged directly by telescopes, but the vast majority have been detected through indirect methods such as the
transit method and the
radial-velocity method. As of June 19, 2015, astronomers have identified 1932 such planets (in 1222
planetary systems and 484
multiple planetary systems).
More than a thousand potential new
planets have been found outside our solar system—nearly doubling the number of candidates discovered so far by
NASA's Kepler space telescope, according to a new study.
The fresh batch of Kepler Objects of Interest, or KOIs, emerged from an analysis of mission data gathered between May 2009 and September 2010.
The data revealed 1,091 possible new planets, bringing the total count to 2,321—up from 1,235 candidates formally announced last February.
(Also see
"'Solar Systems' Common Across the Galaxy, NASA Probe Hints.")
What's more, "we have a statistical reason to think at this point that something like 90 percent of them are probably real planets," said study co-author
Ronald Gilliland, an astronomer at Pennsylvania State University and a member of the Kepler team.
So far, the Kepler team has confirmed the existence of 61 alien planets, including an
Earthlike world that orbits its star at the right distance for life.
It's only the beginning...