{"author":[{"full_name":"Adamo, Angela","last_name":"Adamo","first_name":"Angela"},{"first_name":"Hakim","full_name":"Atek, Hakim","last_name":"Atek"},{"full_name":"Bagley, Micaela B.","last_name":"Bagley","first_name":"Micaela B."},{"last_name":"Bañados","full_name":"Bañados, Eduardo","first_name":"Eduardo"},{"last_name":"Barrow","full_name":"Barrow, Kirk S.S.","first_name":"Kirk S.S."},{"first_name":"Danielle A.","last_name":"Berg","full_name":"Berg, Danielle A."},{"full_name":"Bezanson, Rachel","last_name":"Bezanson","first_name":"Rachel"},{"first_name":"Maruša","last_name":"Bradač","full_name":"Bradač, Maruša"},{"full_name":"Brammer, Gabriel","last_name":"Brammer","first_name":"Gabriel"},{"first_name":"Adam C.","last_name":"Carnall","full_name":"Carnall, Adam C."},{"first_name":"John","last_name":"Chisholm","full_name":"Chisholm, John"},{"first_name":"Dan","last_name":"Coe","full_name":"Coe, Dan"},{"last_name":"Dayal","full_name":"Dayal, Pratika","first_name":"Pratika"},{"first_name":"Daniel J.","last_name":"Eisenstein","full_name":"Eisenstein, Daniel J."},{"full_name":"Eldridge, Jan J.","last_name":"Eldridge","first_name":"Jan J."},{"first_name":"Andrea","last_name":"Ferrara","full_name":"Ferrara, Andrea"},{"first_name":"Seiji","full_name":"Fujimoto, Seiji","last_name":"Fujimoto"},{"first_name":"Anna De","last_name":"Graaff","full_name":"Graaff, Anna De"},{"first_name":"Melanie","last_name":"Habouzit","full_name":"Habouzit, Melanie"},{"last_name":"Hutchison","full_name":"Hutchison, Taylor A.","first_name":"Taylor A."},{"first_name":"Jeyhan S.","last_name":"Kartaltepe","full_name":"Kartaltepe, Jeyhan S."},{"first_name":"Susan A.","last_name":"Kassin","full_name":"Kassin, Susan A."},{"full_name":"Kriek, Mariska","last_name":"Kriek","first_name":"Mariska"},{"full_name":"Labbé, Ivo","last_name":"Labbé","first_name":"Ivo"},{"last_name":"Maiolino","full_name":"Maiolino, Roberto","first_name":"Roberto"},{"full_name":"Marques-Chaves, Rui","last_name":"Marques-Chaves","first_name":"Rui"},{"full_name":"Maseda, Michael V.","last_name":"Maseda","first_name":"Michael V."},{"first_name":"Charlotte","full_name":"Mason, Charlotte","last_name":"Mason"},{"full_name":"Matthee, Jorryt J","orcid":"0000-0003-2871-127X","last_name":"Matthee","first_name":"Jorryt J","id":"7439a258-f3c0-11ec-9501-9df22fe06720"},{"last_name":"Mcquinn","full_name":"Mcquinn, Kristen B.W.","first_name":"Kristen B.W."},{"first_name":"Georges","last_name":"Meynet","full_name":"Meynet, Georges"},{"first_name":"Rohan P.","last_name":"Naidu","full_name":"Naidu, Rohan P."},{"last_name":"Oesch","full_name":"Oesch, Pascal A.","first_name":"Pascal A."},{"last_name":"Pentericci","full_name":"Pentericci, Laura","first_name":"Laura"},{"first_name":"Pablo G.","full_name":"Pérez-González, Pablo G.","last_name":"Pérez-González"},{"last_name":"Rigby","full_name":"Rigby, Jane R.","first_name":"Jane R."},{"last_name":"Roberts-Borsani","full_name":"Roberts-Borsani, Guido","first_name":"Guido"},{"full_name":"Schaerer, Daniel","last_name":"Schaerer","first_name":"Daniel"},{"last_name":"Shapley","full_name":"Shapley, Alice E.","first_name":"Alice E."},{"first_name":"Daniel P.","last_name":"Stark","full_name":"Stark, Daniel P."},{"first_name":"Massimo","last_name":"Stiavelli","full_name":"Stiavelli, Massimo"},{"last_name":"Strom","full_name":"Strom, Allison L.","first_name":"Allison L."},{"last_name":"Vanzella","full_name":"Vanzella, Eros","first_name":"Eros"},{"first_name":"Feige","last_name":"Wang","full_name":"Wang, Feige"},{"last_name":"Wilkins","full_name":"Wilkins, Stephen M.","first_name":"Stephen M."},{"first_name":"Christina C.","last_name":"Williams","full_name":"Williams, Christina C."},{"last_name":"Willott","full_name":"Willott, Chris J.","first_name":"Chris J."},{"first_name":"Dominika","last_name":"Wylezalek","full_name":"Wylezalek, Dominika"},{"full_name":"Nota, Antonella","last_name":"Nota","first_name":"Antonella"}],"date_created":"2025-08-31T22:01:32Z","publisher":"Springer Nature","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","OA_type":"green","abstract":[{"lang":"eng","text":"With stunning clarity, the JWST has revealed the Universe’s first billion years. The scientific community is analysing a wealth of JWST imaging and spectroscopic data from that era, and is in the process of rewriting the astronomy textbooks. Here, as a result of the 2024 ISSI Breakthrough Workshop, we provide a snapshot of the great progress made towards understanding the initial chapters of our cosmic history 1.5 years into the JWST science mission. We present the current census of early galaxies, their luminosities, appearance, chemical composition, masses and formation histories as revealed by JWST. We relate the discovery of massive black holes in early galaxies and discuss their demographics and implications for their formations and growth. We conclude by describing the potential sources of reionization and our current understanding of how the Universe became fully ionized. Throughout the Perspective, we highlight discoveries and breakthroughs, topics and issues that are not yet understood, and questions that will be addressed in the coming years, as JWST continues its revolutionary observations of the early Universe."}],"external_id":{"arxiv":["2405.21054"],"isi":["001547681400001"]},"main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2405.21054"}],"article_processing_charge":"No","oa_version":"Preprint","type":"journal_article","language":[{"iso":"eng"}],"oa":1,"quality_controlled":"1","month":"08","doi":"10.1038/s41550-025-02624-5","scopus_import":"1","title":"The first billion years according to JWST","OA_place":"repository","date_updated":"2025-09-30T14:28:42Z","volume":9,"publication_status":"published","day":"01","isi":1,"publication":"Nature Astronomy","intvolume":"         9","citation":{"short":"A. Adamo, H. Atek, M.B. Bagley, E. Bañados, K.S.S. Barrow, D.A. Berg, R. Bezanson, M. Bradač, G. Brammer, A.C. Carnall, J. Chisholm, D. Coe, P. Dayal, D.J. Eisenstein, J.J. Eldridge, A. Ferrara, S. Fujimoto, A.D. Graaff, M. Habouzit, T.A. Hutchison, J.S. Kartaltepe, S.A. Kassin, M. Kriek, I. Labbé, R. Maiolino, R. Marques-Chaves, M.V. Maseda, C. Mason, J.J. Matthee, K.B.W. Mcquinn, G. Meynet, R.P. Naidu, P.A. Oesch, L. Pentericci, P.G. Pérez-González, J.R. Rigby, G. Roberts-Borsani, D. Schaerer, A.E. Shapley, D.P. Stark, M. Stiavelli, A.L. Strom, E. Vanzella, F. Wang, S.M. Wilkins, C.C. Williams, C.J. Willott, D. Wylezalek, A. Nota, Nature Astronomy 9 (2025) 1134–1147.","apa":"Adamo, A., Atek, H., Bagley, M. B., Bañados, E., Barrow, K. S. S., Berg, D. A., … Nota, A. (2025). The first billion years according to JWST. <i>Nature Astronomy</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41550-025-02624-5\">https://doi.org/10.1038/s41550-025-02624-5</a>","chicago":"Adamo, Angela, Hakim Atek, Micaela B. Bagley, Eduardo Bañados, Kirk S.S. Barrow, Danielle A. Berg, Rachel Bezanson, et al. “The First Billion Years According to JWST.” <i>Nature Astronomy</i>. Springer Nature, 2025. <a href=\"https://doi.org/10.1038/s41550-025-02624-5\">https://doi.org/10.1038/s41550-025-02624-5</a>.","mla":"Adamo, Angela, et al. “The First Billion Years According to JWST.” <i>Nature Astronomy</i>, vol. 9, no. 8, Springer Nature, 2025, pp. 1134–47, doi:<a href=\"https://doi.org/10.1038/s41550-025-02624-5\">10.1038/s41550-025-02624-5</a>.","ieee":"A. Adamo <i>et al.</i>, “The first billion years according to JWST,” <i>Nature Astronomy</i>, vol. 9, no. 8. Springer Nature, pp. 1134–1147, 2025.","ama":"Adamo A, Atek H, Bagley MB, et al. The first billion years according to JWST. <i>Nature Astronomy</i>. 2025;9(8):1134-1147. doi:<a href=\"https://doi.org/10.1038/s41550-025-02624-5\">10.1038/s41550-025-02624-5</a>","ista":"Adamo A, Atek H, Bagley MB, Bañados E, Barrow KSS, Berg DA, Bezanson R, Bradač M, Brammer G, Carnall AC, Chisholm J, Coe D, Dayal P, Eisenstein DJ, Eldridge JJ, Ferrara A, Fujimoto S, Graaff AD, Habouzit M, Hutchison TA, Kartaltepe JS, Kassin SA, Kriek M, Labbé I, Maiolino R, Marques-Chaves R, Maseda MV, Mason C, Matthee JJ, Mcquinn KBW, Meynet G, Naidu RP, Oesch PA, Pentericci L, Pérez-González PG, Rigby JR, Roberts-Borsani G, Schaerer D, Shapley AE, Stark DP, Stiavelli M, Strom AL, Vanzella E, Wang F, Wilkins SM, Williams CC, Willott CJ, Wylezalek D, Nota A. 2025. The first billion years according to JWST. Nature Astronomy. 9(8), 1134–1147."},"acknowledgement":"While this Perspective is written by a small number of authors, invited to ISSI Bern in March 2024 as part of the 2024 ISSI Breakthrough Workshop, we acknowledge the work of a large community that is advancing our collective understanding of the evolution of the early Universe. We thank ISSI for sponsoring the 2024 Breakthrough Workshop, and the ISSI staff for their wonderful welcome and support. We are grateful to the author collaborators, who made this paper possible. Collectively, we are grateful to the large group of committed scientists and engineers, worldwide, who designed, built and commissioned the JWST and made a decades-long astronomer dream a reality. R.P.N. is a NASA Hubble Fellow. We are grateful to M. Dickinson for a careful read of the final paper and to F. Crameri (ISSI) for his expert help designing the very best figures. We dedicate this paper to the 20,000 people who spent decades to make JWST an incredible discovery machine.","issue":"8","publication_identifier":{"eissn":["2397-3366"]},"status":"public","year":"2025","page":"1134-1147","article_type":"original","_id":"20255","date_published":"2025-08-01T00:00:00Z","arxiv":1,"department":[{"_id":"JoMa"}]}