{"paper":{"title":"Two Earth-sized planets orbiting Kepler-20","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Andrew W. Howard, Christopher E. Henze, Courtney D. Dressing, Daniel C. Fabrycky, Darin Ragozzine, David Charbonneau, David G. Koch, David R. Ciardi, David W. Latham, Dimitar D. Sasselov, Eric B. Ford, Fergal Mullally, Francois Fressin, Geoffrey W. Marcy, Guillermo Torres, Jack J. Lissauer, Jason F. Rowe, Jean-Michel Desert, Jon M. Jenkins, Joseph D. Twicken, Kamal Uddin, Lars A. Buchhave, Leslie A. Rogers, Martin Still, Matthew J. Holman, Natalie M. Batalha, Samuel N. Quinn, Sarah Ballard, Sara Seager, Shawn E. Seader, Stephen T. Bryson, Steve B. Howell, Susan E. Thompson, Thomas Barclay, Thomas N. Gautier III, William J. Borucki","submitted_at":"2011-12-20T02:53:06Z","abstract_excerpt":"Since the discovery of the first extrasolar giant planets around Sun-like stars, evolving observational capabilities have brought us closer to the detection of true Earth analogues. The size of an exoplanet can be determined when it periodically passes in front of (transits) its parent star, causing a decrease in starlight proportional to its radius. The smallest exoplanet hitherto discovered has a radius 1.42 times that of the Earth's radius (R Earth), and hence has 2.9 times its volume. Here we report the discovery of two planets, one Earth-sized (1.03R Earth) and the other smaller than the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1112.4550","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}