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COVER Stylized comparison of the inner solar system (top) and ( G, M1 u% A/ Q1 ?5 [
Kepler-62 (bottom), a five-planet system about 1200 light-years away. Like our
# p: v* E3 A- a: Xsolar system, Kepler-62 hosts two planets in its habitable zone (depicted in
6 Y5 _5 a. }/ C6 m- t% Dgreen), the region around a star where a planet could conceivably maintain
% x. Q% E/ ?$ t: Hliquid water on its surface. The special section beginning on page 565
+ i7 F& `3 Z. M+ usummarizes what we currently know about extrasolar planets. Illustration:
& d# O4 x) b+ t6 r# k8 E7 [NASA/Jet Propulsion Laboratory–Caltech/T. Pyle / s( D5 r/ X( r" D }
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