1: Two scientists are suggesting that the inner solar system once played host to a bunch of  super-Earths  -- planets that were larger than our own but smaller than Neptune . 2: He and his co-author -- Gregory Laughlin of University of California , Santa Cruz -- are building on a scenario of Jupiter 's migration that was previously put forward by other scientists . 3: Scientists : An epic migration by Jupiter led to destruction of  super-Earths 
1: Two scientists 2: He and his co-author -- Gregory Laughlin of University of California , Santa Cruz 3: Scientists