Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Universe was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 17 days and the median time to publication was 35 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abbrescia, Marcello | Lepe, Samuel |
| Abouelmagd, E. I. | Lesur, Maxime |
| Agarwal, Nishant | Lev, Felix M. |
| Agathos, Alexander | Li, Bo |
| Agop, Maricel | Li, Jian |
| Aguerri, José Alfonso | Li, Xiaocan |
| Akcay, Sarp | Li, Yufeng |
| Akhmedov, Emil | Liakos, Alexios |
| Akiyama, Kazunori | Liang, Shidong |
| Alessi, Elisa Maria | Licata, Ignazio |
| Alexeyev, Stanislav | Liegener, Klaus |
| Alexiou, Spiros | Lin, Chia-Min |
| Allen, Branden T. | Lin, Guey-Lin |
| Alonso-Serrano, Ana | Lin, Lap-Ming |
| Altschul, Brett | Linares, Roberto |
| Altwegg, Kathrin | Ling, Yi |
| Alvarez-Castillo, David Edwin | Linhares, César |
| Alves, Marcio | Link, Jonathan |
| An, Haipeng | Liu, Fuhu |
| Anastopoulos, Charis | Liu, N. |
| Andersen, Thomas | Liu, Xiang |
| Anguelova, Lilia | Liukkonen, Jukka |
| Antonelli, Marco | Lobato, Ronaldo |
| Appleby, Stephen | Lobo, Iarley |
| Armoni, Adi | Lobo, Iarley Pereira |
| Arnould, Marcel | Loewe, Marcelo |
| Aros, Rodrigo | Logoteta, Domenico |
| Arraut, Ivan | Lombriser, Lucas |
| Arshakian, Tigran G. | López-Moya, Marcos |
| Artymowski, Michal | Lovell, Mark |
| Arvanitakis, Alex S. | Luciano, Giuseppe Gaetano |
| Arzano, Michele | Lucini, Biagio |
| Asorey, Jacobo | Lukierski, Jerzy |
| Aste, Andreas | Luning, Sebastian |
| Atchison, Justin A. | Luongo, Orlando |
| Attie, David | Luque-Escamilla, Pedro L. |
| Avelino, Pedro | Lyakhov, Andrey |
| Aviles, Alejandro | Lyutikov, Maxim |
| Awasthi, Arun Kumar | Macedo, Caio |
| Ayriyan, Alexander | Maeder, Andre |
| Badziak, Marcin | Magdy, Niseem |
| Balázs, Heilig | Malek, Emanuel |
| Baldo, Marcello | Malgieri, Massimiliano |
| Bamba, Kazuharu | Malkiewicz, Przemyslaw |
| Barabash, Alexander | Malkov, Oleg |
| Barak, Liron | Maltseva, O. A. |
| Barbaro, Maria B. | Malyshev, Denys |
| Barbero, Fernanado | Mamun, A. A. |
| Barboza, Edésio Miguel | Marachevsky, Valery |
| Bargueno, Pedro | Marciano, Antonino |
| Barnich, Glenn | Margalit, Ben |
| Barrau, Aurelien | Mariani, Camillo |
| Bartelmann, Matthias | Marle, Charles-Michel |
| Batista, Rafael Alves | Marochnik, Leonid |
| Baù, Giulio | Martello, Daniele |
| Baum, Sebastian | Martí, Josep |
| Bazilevskaya, Galina Alexandrovna | Martín, Eduardo L. |
| Beesham, Aroonkumar | Martín-Albo, Justo |
| Behunin, Ryan | Martin-Benito, Mercedes |
| Bellini, Gianpaolo | Martineau, Killian |
| Beltran Jimenez, Jose | Martino, Ivan De |
| Benedetti, Dario | Martucci, Matteo |
| Benetti, Micol | Marziani, Paola |
| Benkő, József | Marzola, Luca |
| Beraudo, Andrea | Maslov, Konstantin A. |
| Berezin, Victor Alexandrovich | Mastrolia, Pierpaolo Mastrolia |
| Berger, Niklaus | Masullo, Maria Rosaria |
| Bergeron, Hervé | Mateos Guilarte, Juan |
| Berton, Marco | Matsuno, Ken |
| Bettoni, Daniela | Matteo, Armando Di |
| Bhattacharyya, Trambak | Mattingly, David |
| Biesiada, Marek | Mavromatos, Nick E. |
| Bini, Donato | Mavromichalaki, Helen |
| Bisnovatyi-Kogan, Gennady S. | Mayerson, Daniel R. |
| Bobomurat, Ahmedov | Mazin, Daniel |
| Bonanno, Alfio | Mazzitelli, Francisco Diego |
| Bonatsos, Dennis | McCollough, Michael |
| Bonometto, Silvio A. | Melkikh, Alexey V. |
| Bonora, L. | Melnikov, Alexey A. |
| Bonventre, Richard | Mena-Barboza, Eri A. |
| Bopp, Fritz W. | Mena-Marugan, Guillermo A. |
| Bordag, Michael | Menci, Nicola |
| Borges, Marcelo | Menéndez, Javier |
| Borisova, T. D. | Mennickent, Ronald |
| Borka, D. | Meyer, Dominique |
| Bormashenko, Edward | Meyer, Manuel |
| Bornyakov, Vitaly | Micol, Benetti |
| Borowiec, Andrzej | Mielke, Eckehard |
| Bouwmeester, Dirk | Mignani, Roberto |
| Brahma, Suddhasattwa | Miković, Aleksandar R. |
| Branca, Antonio | Millington, Peter |
| Brandenberger, Robert H. | Milton, Kimball A. |
| Brandt, Bastian | Mimoso, José P. |
| Bressan, Alessandro | Minkevich, Albert |
| Brevik, Iver H. | Miralles, Juan Antonio |
| Brose, Robert | Miranda, Omar G. |
| Brugnera, Riccardo | Miscetti, Stefano |
| Buchert, Stephan C. | Mitchell, Alison |
| Buchholz, Detlev | Mohr, Peter |
| Burdin, Sergey | Moniz, Paolo Vargas |
| Burgdorf, Martin | Moore, Christopher J. |
| Busso, Maurizio M. | Morikawa, Masahiro |
| Caceres, Elena | Morlino, Giovanni |
| Cahay, Marc M. | Morozumi, Takuya |
| Cai, Qingyu | Moshin, Pavel Yu. |
| Calloni, Enrico | Mosquera Cuesta, Herman J. |
| Cander, Ljiljana R. | Moulin, Emmanuel |
| Cao, Junjie | Mourenas, D. |
| Cao, Zhen | Moustakidis, Charalampos |
| Capistrano, Abraao J. S. | Mueck, Wolfgang |
| Capozziello, Salvatore | Munch, Jesper |
| Cappelluti, Nico | Mushtukov, Alexander |
| Cappuzzello, Francesco | Nagasawa, Michiyasu |
| Cardone, Fabio | Nagirner, Dmitrij I. |
| Carpano, Stefania | Nakamura, Atsushi |
| Casadio, Carolina | Nara, Yasushi |
| Casadio, Roberto | Natário, José |
| Caso, Loredana | Nathanail, Antonios |
| Casolino, Marco | Navarro-Salas, Jose |
| Cassani, Davide | Nedkova, Petya G. |
| Cattaneo, Paolo W. | Neronov, Andrii |
| Cavalcanti, Rogerio Teixeira | Neuhäuser, Ralph |
| Cei, Fabrizio | Neves, J. C. S. |
| Cella, Giancarlo | Ng, Alfred |
| Cembranos, Jose A. R. | Nguyen, Ann |
| Ceriotti, Matteo | Nicastro, Luciano |
| Cerri, Silvio Sergio | Nicolas, Chamel |
| Cervantes-Cota, Jorge | Nigro, Cosimo |
| Cesarini, Andrea | Nikolaevich, Frolov Boris |
| Chakraborty, Nachiketa | Nikulov, Alexey V. |
| Char, Prasanta | Nishikawa, Ken-Ichi |
| Chatwin-Davies, Aidan | Nogueira, Flavio S. |
| Chatzistavrakidis, Athanasios | Nojiri, Shin'ichi |
| Chen, Che-Yu | Nordhaus, Jason |
| Chernodub, Maxim | Nowakowski, Marek |
| Chernyshov, Dmitrii O. | Nozzoli, Francesco |
| Chervon, Sergei | Nunes, Nelson |
| Chiofalo, Maria Luisa | Nunes, Rafael C. |
| Chiosi, Cesare | Nurmagambetov, A. J. |
| Chodos, Alan | Nuth, Joseph A. |
| Choudhury, Sayantan | Obukhov, Yuri |
| Cirigliano, Vincenzo | Odintsov, Sergei |
| Claude, Semay | Oliveira, Fernando |
| Claudi, Riccardo | Oliveri, Roberto |
| Cleaver, Gerald | Orazi, Emanuele |
| Co, Raymond T. | Orlandini, Mauro |
| Cohen, Thomas | Ortega, Pablo G. |
| Colas, Paul | Osetrin, Konstantin |
| Colgain, Eoin | Oshita, Naritaka |
| Colgáin, Eoin Ó. | Ovalle, Jorge |
| Colò, Gianluca | Ovgun, Ali |
| Colón, Cristóbal | Oxman, Luis E. |
| Combrinck, Ludwig | Ozaydin, Fatih |
| Correa, Diego | Pagano, Davide |
| Cortes, Jose | Pagliara, Giuseppe |
| Costa, João Lopes | Pagnanini, Lorenzo |
| Costa, L. Filipe O. | Paic, Guy |
| Couchot, Francois | Pais, Helena Sofia |
| Coughlin, Michael | Pais, Pablo |
| Cremaschini, Claudio | Pala, Francesca |
| Criss, Robert E. | Palasantzas, George |
| Cristallo, Sergio | Palma, Francesco |
| Cristea, Irina | Palmerini, Sara |
| Cristofari, Pierre | Pamucar, Dragan |
| Cruz Osorio, Alejandro | Panotopoulos, Grigoris |
| Cui, Wei | Papaderos, Polychronis |
| Curiel, Erik | Papadimitriou, Constantinos |
| Cusin, Giulia | Papaioannou, Athanasios |
| Cvetkovic, Branislav | Papitto, Alessandro |
| Czerny, Bozena | Pappas, George |
| Czuchry, Ewa | Parkinson, David |
| Dabrowski, Mariusz | Parotto, Paolo |
| Damiani, Francesco | Partouche, Hervé |
| Darmora, Smita | Paschos, Emmanuel A. |
| Dasgupta, Keshav | Passek-Kumeriçki, Kornelija |
| Datta, R. | Passon, Oliver |
| Dave, Romeel | Pastore, Alessandro |
| Davidson, Aharon | Paul, Tanmoy |
| De Angelis, Alessandro D. | Paulos, Miguel F. |
| De Araujo, Jose Carlos Neves | Paunzen, Ernst |
| De Diego Onsurbe, José Antonio | Pavón, Diego |
| De Freitas-Pacheco, José Antonio | Pegoraro, Francesco |
| De Holanda, Pedro Cunha | Percacci, Roberto |
| De Jesus, José Fernando | Pereira, J. G. |
| De La Peña, Luis | Pereira, S. H. |
| De Martino, Ivan | Peres, Orlando |
| De Mello, Eugênio Ramos Bezerra | Perez, Alejandro |
| De Paolis, Francesco | Perivolaropoulos, Leandros |
| De Sanctis, Maria Cristina | Perrino, Roberto |
| Decca, Ricardo S. | Peter, Patrick |
| Dedkov, G. V. | Petroni, Nicola Cufaro |
| Degl'Innocenti, Scilla | Petrov, Albert |
| Degollado Daza, Juan Carlos | Petruzziello, Luciano |
| Degollado, Juan Carlos | Pezzella, Franco |
| Del Popolo, Antonino | Piatti, Andres E. |
| Del Sordo, Stefano | Picanço, Rodrigo |
| Dell'Agli, Flavia | Piemontese, Stefano |
| Dembinski, Hans | Pierrehumbert, Raymond |
| Deming, L. Drake | Pignalberi, Alessio |
| Demura, Alexander | Pikuz, Tatiana |
| Deppman, Airton | Pillepich, Annalisa |
| Deriglazov, Alexei | Pinčák, Richard |
| Descouvemont, Pierre | Pirozhenko, Irinia |
| Di Crescenzo, Antonia | Piscoran, Laurian-Ioan |
| Di Fillipo, Francesco | Pithis, Andreas G. A. |
| Di Giacomo, Adriano | Pitkin, Matthew D. |
| Di Mauro, Marco | Platania, Alessia |
| Di Valentino, Eleonora | Podgornik, Rudi |
| Dialektopoulos, Konstantinos | Poedts, Stefaan |
| Diamantini, Maria Cristina | Poggiani, Rosa |
| Dieks, Dennis | Polarski, David |
| Dimitrijević, Milan S. | Polonyi, Janos |
| Dimopoulos, Konstantinos | Polosa, Antonio D. |
| Dmitry, Blinov | Ponomarev, Dmitry |
| Dokuchaev, Vyacheslav | Popa, Lucia Aurelia |
| Dolgov, Alexander | Popov, Arkadiy |
| Domi, Alba | Popov, Sergei B. |
| Doneva, Daniela D. | Portillo, Israel |
| Doroshkevich, Andrey | Pozdeeva, Ekaterina O. |
| Dubeibe, Fredy L. | Preka-Papadema, Panagiota |
| Duranti, Matteo | Providencia, Constança |
| Dybalski, Wojciech | Pshirkov, Maxim |
| Dymnikova, Irina | Pushkarev, Alexander |
| Ellerman, David | Qi, Chong |
| Elsaesser, Dominik | Quartin, Miguel |
| Entem, David R. | Radinschi, Irina |
| Esquivel-Sirvent, R. | Raffelt, Georg |
| Etesi, Gabor | Raggi, Mauro |
| Ettori, Stefano | Rajendra, Gupta |
| Exirifard, Qasem | Ramos, Angels |
| Fabbri, Luca | Rashkov, Radoslav |
| Fabregat, Juan | Rastgoo, Saeed |
| Falciano, F. T. | Ratti, Claudia |
| Falls, Kevin G. | Rebouças, Marcelo |
| Farres, Ariadna | Reichert, Manuel |
| Favole, Ginevra | Ricci, Fulvio |
| Feng, James Q. | Richarte, Martín G. |
| Feoli, Antonio | Rincón, Ángel |
| Fermi, Davide | Ring, Peter |
| Fernández, Francisco | Rizos, John |
| Fernández-Ontiveros, Juan A. | Robertson, Hamish |
| Ferraro, Rafael | Rocha, Jorge |
| Ferreira, Márcio | Rodrigues, Davi |
| Ferri, Elena | Rodriguez, Manuel |
| Fidaleo, Francesco | Rodriguez-Lopez, Pablo |
| Fields, Chris | Rogatko, Marek |
| Figueiredo, Cosme Alexandre O. B. | Romano, Vittorio |
| Filippov, Anatoly Vasilievich | Romanyuk, Iosif |
| Fillion-Gourdeau, François | Ronga, Francesco |
| Finoguenov, Alexis | Roshchupkin, Sergei P. |
| Flachi, Antonino | Rosmej, Frank |
| Fomin, Igor Vladimirovich | Rott, Carsten |
| Fortes, Elaine C. F. S. | Rovelli, Carlo |
| Foschini, Luigi | Rubiera-Garcia, Diego |
| Foster, Adam | Rudenko, Sergei |
| Friedman, Yaakov | Rueda, Jorge |
| Fujiwara, Mamoru | Ruiz-Granados, Beatriz |
| Gadella, Manuel | Rybczyński, Maciej |
| Gail, Hans-Peter | Sá, Paulo M. |
| Gaite, Jose | Sabido, Miguel |
| Gambacurta, Danilo | Sabín, Carlos |
| Gao, Changjun | Sahlén, Martin |
| Gao, Sijie | Sahoo, Pradyumn Kumar |
| Garain, Sudip K. | Said, Jackson Levi |
| Garay, Luis J. | Salafia, Om |
| García Aspeitia, Miguel Angel | Salucci, Paolo |
| Garcia De Andrade, Luiz | Sanchez Contreras, Carmen |
| García-Compean, Hugo | Sanchez, Norma G. |
| Garcia-Hernandez, Domingo Anibal | Sánchez, Sebastian F. |
| Gasparrini, Dario | Santopinto, Elena |
| Gasperini, Maurizio | Santos, Alesandro |
| Gavrilov, Boris | Sapone, Domenico |
| Gavrilov, Sergey | Saridakis, Emmanuel |
| Geng, Chaoqiang | Saridakis, Manos |
| Gerdjikov, Vladimir Stefanov | Sasakura, Naoki |
| Gerontidou, Maria | Satz, Helmut |
| Giammarchi, Marco | Savelova, Elena |
| Gianotti, Paola | Scarr, Tzvi |
| Gieres, François | Schäfer, Gerhard |
| Gil-Świderska, Agnieszka | Schettino, Giulia |
| Giordano, Matteo | Schmidt, Michael A. |
| Glushkov, Alexander V. | Schmieder, Brigitte |
| Gnecchi, Alessandra | Schoeffler, Kevin |
| Godłowski, Włodzimierz | Schoppmann, Stefan |
| Golovnev, Alexey | Schreck, Marco |
| Gómez, Diego Sáez-Chillón | Schröder, Stefan |
| Gómez-Valent, Adrià | Sebastiani, Lorenzo |
| González García, Maria Concepción | Secrest, Jeffery |
| González Romero, Luis Manuel | Sedaghati, Elyar |
| Good, Michael R. R. | Sedrakian, Armen |
| Goodsell, Mark | Seo, Min-Seok |
| Gorbunov, Dmitry | Sesana, Alberto |
| Gordon, Christopher | Sgalaberna, Davide |
| Goudarzi, Mohammad Ali | Sgouros, Onoufrios |
| Gourgouliatos, Konstantinos | Shankar, Karthik H. |
| Grassi, Pietro Antonio | Shapiro, Ilya |
| Graziani, Luca | Shapiro, Irwin |
| Greensite, Jeffrey Paul | Sharov, German Sergeevich |
| Grib, A. A. | Shen, Fang |
| Grøn, Øyvind | Sheykin, Anton A. |
| Grunfeld, Ana Gabriela | Shi, Jianrong |
| Guendelman, Eduardo | Shore, Graham |
| Guimarães, Marcelo | Shtanov, Yuri |
| Gulminelli, Francesca | Silva, Marcos V. De S. |
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| Guo, Minyong | Singleton, Douglas |
| Guo, Yiqing | Sinitsyna, Vera |
| Gupt, Brajesh | Smirnov, Alexei |
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| Hamber, Herbert W. | Sofue, Yoshiaki |
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| Hayakawa, Takehito | Soma, Arun Kumar |
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| Hoffmann, Andreas | Staykov, Kalin V. |
| Hofmann, Ralf | Steffen, Gielen |
| Hofmeister, Anne | Steinheimer, Jan |
| Hohmann, Manuel | Stenflo, Lennart |
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| Hong, Byungsik | Stornaiolo, Cosimo |
| Horatiu, Nastase | Stratta, Giulia |
| Horn, Bart | Strong, Andrew W. |
| Høye, Johan | Sultana, Joseph |
| Hu, Bin | Sushkov, Sergei |
| Huang, Feifei | Tan, Baolin |
| Hugbart, Mathilde | Tang, Qingwen |
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| Iguchi, Hideo | Tedesco, Luigi |
| Impens, Francois | Teixeira Alves, Danilo |
| Inagaki, Tomohiro | Terranova, Francesco |
| Incicchitti, Antonella | Tessarotto, Massimo |
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| Ivanov, Martin V. | Tomasiello, Alessandro |
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| Jawad, Abdul | Triantafyllopoulos, Alkiviadis |
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| Jokela, Niko | Turimov, Bobur |
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| Jordi, Carme | Valcarcel, Jorge Gigante |
| Joung, Euihun | Vallenari, Antonella |
| Junker, Georg | Van De Meent, Maarten |
| Jusufi, Kimet | Van de Steene, Griet C. |
| Kalantonis, Vassilis | Van Den Heuvel, Edward P. J. |
| Kallunki, Juha | Vandevender, John Pace |
| Kamenshchik, A. Yu | Varekamp, Johan |
| Kaminker, Alexander D. | Varieschi, Gabriele U. |
| Kannawadi, Arun | Vasko, Ivan Y. |
| Karbstein, Felix | Vassilevich, Dmitri |
| Karch, Andreas | Vazquez, J. Alberto |
| Kasetti, Siva Prasad | Velten, Hermano |
| Kashi, Amit | Ventura, Paolo |
| Katsova, Maria | Veres, Péter |
| Kazanas, Demosthenes | Vernieri, Daniele |
| Keppens, Arno | Villaseñor, Eduardo J. S. |
| Kerner, Richard | Vilmer, Nicole |
| Ketov, Sergei | Vink, Jacco |
| Khan, Amir N. | Visinelli, Luca |
| Khanna, Faqir C. | Visser, Manus |
| Khlopov, Maxim | Vitiello, Giuseppe |
| Khurshudyan, Martiros | Von Marttens, Rodrigo |
| Khusnutdinov, Nail | Wagner, Fabian |
| Kieda, David | Wagner, Jenny |
| Kim, Choong | Waldron, Abbey |
| Kim, Dong-Woo | Wang, Anzhong |
| Kim, Nakwoo | Wang, Gaige |
| Kirillov, Alexander | Wang, Qiliang |
| Kirschner, Roland | Wang, Shao-Jiang |
| Kislov, Roman | Wascko, Morgan |
| Kisslinger, Leonard S. | Weber, Fridolin |
| Kitamoto, Shunjii | Weissman, Dorin |
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| Klimenko, Maksim V. | Wiita, Paul |
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| Kohri, Kazunori | Wysokinski, Karol I. |
| Kole, Merlin Reynaard | Xie, Fuguo |
| Kološ, Martin | Xu, Renxin |
| Komissarov, Serguei S. | Xu, Rui |
| Konishi, Kenichi | Yamada, Masatoshi |
| Kosinski, Piotr | Yates, Jeremy A. |
| Kosmas, Theocharis | Yeom, Dong-han |
| Kotikov, Anatoly | Yoshii, Ryosuke |
| Kotila, Jenni | Youssef Moussa, Miled Hassan |
| Kraniotis, Georgios V. | Yungelson, Lev R. |
| Kratz, Karl-Ludwig | Zabrodin, Evgeny |
| Krssak, Martin | Zakharov, Alexander |
| Kuin, Paul | Zhang, Baocheng |
| Kun, Emma | Zhang, Fan |
| Kunz, Martin | Zhang, Guohui |
| Laha, Sibasish | Zhang, Haocheng |
| Laliotis, Athanasios | Zhao, Hongsheng |
| Lapi, Andrea | Zhong, Jiahao |
| Latosh, Boris | Ziaeepour, Houri |
| Leahy, Denis | Zijlstra, Albert |
| Lebiedowicz, Piotr | Zimovets, Ivan |
| Lee, Chien-Hsiu | Zivieri, Roberto |
| Lee, Hyun Su | Zong, Qiugang |
| Leisos, Antonios | Zubkov, Mikhail |
| Lenske, Horst | Zugec, Peter |
| León, Alejandro | Zyuzin, Dmitry A. |
| Leontaris, George K. |
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