A decade ago, stimulated by this discrepancy and the discoveries of the first extrasolar planets, astronomer Alan Boss of the Carnegie Institution resurrected an alternative idea. (scientificamerican.com)
When the first extrasolar planets were found, they seemed so different from those in our own solar system, so the question quickly morphed to «How does our solar system compare with other solar systems?» (discovermagazine.com)
Following the discovery of the first extrasolar planet beyond our solar system in 1992, the number of samples has now reached hundreds. (sciencedaily.com)