1078: #ClassicKenCroswell: Three Origins of Proxima b: 1of2: Ken Croswell @Nature
Photo: No known restrictions on publication.1936. 100 inch telescope dome, Mt. Wilson Observatory http://JohnBatchelorShow.com/contact http://JohnBatchelorShow.com/schedules Parler & Twitter: @BatchelorShow #ClassicKenCroswell: Three Origins of Proxima b: 1of2: Ken Croswell @Nature http://www.nature.com/nature/journal/v536/n7617/full/nature19106.html “… There are three possibilities: the planet migrated in via type I migration; planetary embryos migrated in and coalesced at the current planet’s orbit; or pebbles/small planetesimals migrated via aerodynamic drag and later coagulated into a larger body...."