Back Alley Astronomy

Figure 1.  Io & Europa transit Jupiter. Image credit: NASA/Michael Benson From the start, the search for extrasolar planets has b...

Six low-mass planets orbit Kepler-11; masses are constrained only for the inner five (b-f) No sooner did I post my critical review of ...

Figure 1. Exoplanets between Earth & Uranus in radius (R) and mass (M) The media market for Super Earths remains robust. Two mo...