6124 20230120165911.0 SCART-2023-0053 Ge, J. ET White Paper: To Find the First Earth 2.0 2022 We propose to develop a wide-field and ultra-high-precision photometric survey mission, temporarily named "Earth 2.0 (ET)". This mission is designed to measure, for the first time, the occurrence rate and the orbital distributions of Earth-sized planets. ET consists of seven 30cm telescopes, to be launched to the Earth-Sun's L2 point. Six of these are transit telescopes with a field of view of 500 square degrees. Staring in the direction that encompasses the original Kepler field for four continuous years, this monitoring will return tens of thousands of transiting planets, including the elusive Earth twins orbiting solar-type stars. The seventh telescope is a 30cm microlensing telescope that will monitor an area of 4 square degrees toward the galactic bulge. This, combined with simultaneous ground-based KMTNet observations, will measure masses for hundreds of long-period and free-floating planets. Together, the transit and the microlensing telescopes will revolutionize our understandings of terrestrial planets across a large swath of orbital distances and free space. In addition, the survey data will also facilitate studies in the fields of asteroseismology, Galactic archeology, time-domain sciences, and black holes in binaries. NO Astrophysics - Instrumentation and Methods for Astrophysics Astrophysics - Earth and Planetary Astrophysics Astrophysics - Astrophysics of Galaxies Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Solar and Stellar Astrophysics Zhang, H. Zang, W.C. Deng, H.P. Mao, S. Xie, J.-W. Liu, H.-G. Zhou, J.-L. Willis, K. Huang, Ch. Howell, S.B. Feng, F. Zhu, J.P. Yao, X.Y. Liu, B.B. Aizawa, M.T. Zhu, W. Li, Y.-P. Ma, B. Ye, Q.Z. Yu, J. Xiang, M.S. Yu, C. Liu, S.F. Yang, M. Wang, M.-T. Shi, X. Fang, T. Zong, W.K. Liu, J.Z. Zhang, Y. Zhang, L.Y. El-Badry, K. Shen, R.F. Tam, P.-H. T. Hu, Z.C. Yang, Y. Zou, Y.-C. Wu, J.-L. Lei, W.-H. Wei, J.-J. Wu, X.-F. Sun, T.-R. Wang, F.-Y. Zhang, B.-B. Xu, D. Yang, Y.-P. Li, W.-X. Xiang, D.-F. Wang, X.F. Wang, T.G. Zhang, B. Jia, P. Yuan, H.B. Zhang, J.H. Xuesong, Wang S. Gan, T.J. Wang, W. Zhao, Y.N. Liu, Y.J. Wei, Ch.X. Kang, Y.W. Yang, B.Y. Qi, C. Liu, X.H. Zhang, Q. Zhu, Y. Zhou, D. Zhang, C.C. Yu, Y. Zhang, Y.S. Li, Y. Tang, Z.H. Wang, C.Y. Wang, F.T. Li, W. Cheng, P.F. Shen, C. Li, B.P. Pan, Y. Yang, S. Gao, W. Song, Z.X. Wang, J. Zhang, H.F. Chen, C. Wang, H. Zhang, J. Wang, Z.Y. Zeng, F. Zheng, Z.H. Zhu, J. Guo, Y.F. Zhang, Y.H. Li, Y.D. Wen, L. Feng, J. Chen, W. Chen, K. Han, X.B. Yang, Y.Q. Wang, H.Y. Duan, X.L. Huang, J.J. Liang, H. Bi, S.L. Gai, N. Ge, Z.H. Guo, Z. Huang, Y. Li, G. Li, H.N. Li, T. Yuxi, . Lu, . Rix, H.-W. Shi, J.R. Song, F. Tang, Y.K. Ting, Y.-S. Wu, T. Wu, Y.Q. Yang, T.Z. Yin, Q.-Z. Gould, A. Lee, C.-U. Dong, S. Yee, J.C. Shvartzvald, Y. Yang, H.J. Kuang, R.K. Zhang, J.Y. Liao, S.L. Qi, Z.X. Yang, J. Zhang, R.H. Jiang, C. Ou, J.-W. Li, Y.G. Beck, P. Bedding, T.R. Campante, T.L. Chaplin, W.J. Christensen-Dalsgaard, J. García, R.A. Gaulme, P. Gizon, L. Hekker, S. Huber, D. Khanna, S. Li, Y. Mathur, S. Miglio, A. Mosser, B. Ong, J.M.J. Santos, Â.R.G. Stello, D. Bowman, D.M. Lares-Martiz, M. Murphy, S. Niu, J.-S. Ma, X.-Y. Molnár, L. Fu, J.-N. De Cat, P. Su, J. the, ET consortium arXiv 2206.06693 2022 1--116 peter.decat@observatoire.be https://ui.adsabs.harvard.edu/abs/2022arXiv220606693G/abstract 10955912 http://publi2-as.oma.be/record/6124/files/Ge2022_ET_WhitePaper.pdf 3077 http://publi2-as.oma.be/record/6124/files/Ge2022_ET_WhitePaper.gif?subformat=icon icon 3891 http://publi2-as.oma.be/record/6124/files/Ge2022_ET_WhitePaper.jpg?subformat=icon-180 icon-180 published in NONREF