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How Many Earths?
A paper by Catanzarite et. al. arXiv:1103.1443 says
"Here we show that 1.4% to 2.7% of stars like the Sun are expected to have earth analog planets....Our result that Earths are relatively scarce means that a substantial effort will be needed to identify suitable target stars prior to these future missions" A paper by Youdin arXiv:1105.1782 says "...~3 earth like planets with periods below a year." This is for each sun-like star. Youdin also writes "...the implications for habitable earths around Sun-like stars is truly staggering." Both papers base their conclusions on data from the Kepler Space telescope. So who's right? Or are they calculating different things? Rob |
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