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Universe publishes Special Issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions. Special Issues are led by Guest Editors, who are experts on the topic and all Special Issue submissions follow MDPI's standard editorial process. The journal’s Editor-in-Chief and/or designated Editorial Board Member will oversee Guest Editor appointments and Special Issue proposals, checking their content for relevance and ensuring the suitability of the material for the journal. The papers published in a Special Issue will be collected and displayed on a dedicated page of the journal’s website. Further information on MDPI's Special Issue polices and Guest Editor responsibilities can be found here. For any inquiries related to a Special Issue, please contact the Editorial Office.

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Universe: Feature Papers 2024—Space Science

edited by

Ezio Caroli

submission deadline 30 Nov 2024 | Viewed by 308 | Submission Open

Keywords: space mission/instrument/telescope concepts; inflight/in preparation space instrument; instrument performance evaluation; detectors technologies and perspectives; imaging and timing techniques and methods; spectroscopy and polarimetry techniques and methods; observational and analysis techniques and methods; cosmic ray sources emission models; methods for observing gravitational waves and counterparts at other frequencies (from radio to gamma); methods and techniques for planetary (solar and extrasolar) science and exploration; space technology and biomedicine; environmental science; telecommunications; materials science

(This special issue belongs to the Section Space Science)

Challenges and Synergies with Future Gravitational Wave Observatories

edited by Vetrugno Daniele and Riccardo Buscicchio

submission deadline 30 Nov 2024 | Viewed by 283 | Submission Open

Keywords: gravitational waves; LISA; ET; einstein telescope; cosmic explorer; global fit; stochastic gravitational waves background; multifrequency GW observation; GW observatories synergies; GW data analysis

(This special issue belongs to the Section Astroinformatics and Astrostatistics)

New Insights into High-Energy Astrophysics, Galaxies, and Cosmology—Celebrating the 10th Anniversary of the Re-establishment of the Department of Astronomy at Xiamen University (2012–2022)

edited by Taotao Fang, Weimin Gu, Tong Liu and Beibei Liu

submission deadline 15 Dec 2024 | 3 articles | Viewed by 1835 | Submission Open

Keywords: compact objects; exoplanets; interstellar medium; galaxies; active galactic nuclei; cosmology; large-scale structures; time-domain astronomy

Multi-wavelength Properties of Active Galactic Nuclei

edited by

Stefano Vercellone

submission deadline 15 Dec 2024 | 1 articles | Viewed by 807 | Submission Open

Keywords: active galactic nuclei; black-hole physics; accretion; winds; jets; emission mechanism; theoretical modelling; observing facilities; software and databases

(This special issue belongs to the Section Galaxies and Clusters)

Gravity and Cosmology: Exploring the Mysteries of f(T) Gravity

edited by

Jose Carlos Neves De Araujo

, Hemily Gomes Marciano Fortes and

Emmanuel N. Saridakis

submission deadline 20 Dec 2024 | Viewed by 472 | Submission Open

Keywords: gravity; general relativity; teleparallel theory; torsion; extended teleparallel theory; cosmology; compact stars

(This special issue belongs to the Section Gravitation)

Primordial Black Holes from Inflation

edited by

Cristiano Germani

submission deadline 31 Dec 2024 | 6 articles | Viewed by 20114 | Submission Open

Keywords: primordial black holes ; inflation ; statistics ; gravitational collapse

(This special issue belongs to the Section Compact Objects)

Universe: Feature Papers 2024 – Compact Objects

edited by

Nicolas Chamel

submission deadline 31 Dec 2024 | 8 articles | Viewed by 8618 | Submission Open

Keywords: compact object; neutron star; pulsar; magnetar; white dwarf; black hole; X-ray binary

(This special issue belongs to the Section Compact Objects)

Recent Advances in Gravity: A Themed Issue in Honor of Prof. Jorge Pullin on His 60th Anniversary

edited by

Parampreet Singh

submission deadline 31 Dec 2024 | 5 articles | Viewed by 7434 | Submission Open

Keywords: loop quantum gravity; black holes; foundations of quantum mechanics; numerical relativity; problem of time

(This special issue belongs to the Section Gravitation)

Recent Outcomes and Future Challenges in Nuclear Astrophysics

edited by

Giovanni Francesco Ciani

David Rapagnani

and

Eliana Masha

submission deadline 31 Dec 2024 | 5 articles | Viewed by 6585 | Submission Open

Keywords: nuclear astrophysics; astroparticle physics; experimental techniques; BBN; stellar evolution; stellar explosion; observational astronomy

(This special issue belongs to the Section Solar and Stellar Physics)

Universe: Feature Papers 2024—"Galaxies and Clusters"

edited by

Mauro D’Onofrio

submission deadline 31 Dec 2024 | 5 articles | Viewed by 5981 | Submission Open

Keywords: galaxies and clusters; galaxy formation and evolution; the structure of galaxies; dwarf galaxies; star formation in galaxies; galaxy clustering; the halo of galaxies; galaxy satellites; dark matter in galaxies; lensing of galaxies; deep surface brightness images; galaxy counts; machine learning and artificial intelligence for galaxy/cluster analysis

(This special issue belongs to the Section Galaxies and Clusters)

Universe: Feature Papers 2024—'Cosmology'

edited by

Jaime Haro Cases

and

Supriya Pan

submission deadline 31 Dec 2024 | 6 articles | Viewed by 5777 | Submission Open

Keywords: cosmological models; quantum cosmology; dark matter and dark energy; cosmic acceleration; cosmological constants; cosmological perturbation theory; cosmic microwave background (CMB); observational cosmology

(This special issue belongs to the Section Cosmology)

Exotic Scenarios for Compact Astrophysical Objects

edited by

Vlasios Petousis

Charalampos Moustakidis

and Martin Veselsky

submission deadline 31 Dec 2024 | 2 articles | Viewed by 2391 | Submission Open

Keywords: compacts objects; neutron stars; hybrid stars; strange quark stars; boson stars; white dwarfs; dark objects

(This special issue belongs to the Section Compact Objects)

Comets: Tracers of Solar System Formation and Evolution—Celebrating the 20th Anniversary of Rosetta Mission Launch

edited by

Stavro Ivanovski

submission deadline 31 Dec 2024 | 1 articles | Viewed by 2228 | Submission Open

Keywords: comets; protoplanetary disks; space missions/Rosetta; planetary formation; dust and pebble dynamics; cometary ices

(This special issue belongs to the Section Planetary Sciences)

Cosmic Rays and Dark Matter Detection

edited by

Jie Feng

Fernando Barão

and Sami Caroff

submission deadline 31 Dec 2024 | 1 articles | Viewed by 2183 | Submission Open

Keywords: cosmic ray; dark matter; photons; neutrino; axion; black hole; WIMP; astroparticle; solar modulation; Cerenkov detectors

(This special issue belongs to the Section Space Science)

The Local Group in Multi-Dimensions

edited by

Matteo Monelli

and

Giuseppina Battaglia

submission deadline 31 Dec 2024 | Viewed by 426 | Submission Open

Keywords: local group; resolved stellar populations; galaxy evolution; galaxy groups; Milky Way; M31; dwarf galaxies

(This special issue belongs to the Section Galaxies and Clusters)

New Results from Gravitational Wave Detectors

edited by Mengyao Wang and

Fan Zhang

submission deadline 31 Dec 2024 | Viewed by 180 | Submission Open

Keywords: gravitational wave; instrumentation; detector designs and techniques

(This special issue belongs to the Section Compact Objects)

New Frontiers in Particle Physics with Quantum Sensing

edited by

Giuseppe Latino

submission deadline 31 Dec 2024 | Viewed by 155 | Submission Open

Keywords: particle physics; new physics; dark matter search; quantum sensing; new detection techniques

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

keV Warm Dark Matter (ΛWDM) in Agreement with Observations in Tribute to Héctor J. de Vega (2nd Edition)

edited by

Norma G. Sanchez

submission deadline 15 Jan 2025 | Viewed by 279 | Submission Open

Keywords: keV warm dark matter; keV warm dark matter theory; constraints; and observations; keV warm dark matter galaxies; keV warm dark matter supermassive black holes; keV warm dark matter particles; keV warm dark matter (direct and indirect) detection; neutrinos and sterile neutrinos; dark matter production models; direct and indirect searches

(This special issue belongs to the Section Gravitation)

Exploring the Heavy Ion Collisions in Particle Physics

edited by

Marcello Abbrescia

and

Giuseppe Mandaglio

submission deadline 31 Jan 2025 | Viewed by 176 | Submission Open

Keywords: quark– gluon plasma; hadron resonance; partonic interactions; heavy ion collisions; particle physics; (anti)nuclei formation; physics beyond QCD; detector development; theoretical models

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

CP Violation and Flavor Physics

edited by

Andreas Trautner

and

Celso C. Nishi

submission deadline 28 Feb 2025 | 4 articles | Viewed by 5525 | Submission Open

Keywords: CP violation; flavor physics; flavor puzzle; strong CP problem; flavor symmetries; spontaneous CP violation; baryogenesis; leptogenesis

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Origins and Natures of Inflation, Dark Matter and Dark Energy, 2nd Edition

edited by

Kazuharu Bamba

submission deadline 28 Feb 2025 | 4 articles | Viewed by 3461 | Submission Open

Keywords: inflation; dark matter; dark energy; alternative theory of gravity; cosmology; physics in the early universe; cosmological perturbation theory; cosmic microwave background radiation; gravitational waves; large-scale structure of the universe

(This special issue belongs to the Section Cosmology)

Particle Physics and Cosmology: A Themed Issue in Honor of Professor Dimitri Nanopoulos

edited by

Jun-Jie Cao

Yungui Gong

, Tianjun Li and Natsumi Nagata

submission deadline 28 Feb 2025 | 4 articles | Viewed by 3375 | Submission Open

Keywords: particle physics; supersymmetry; grand unified theory; string model building; cosmology

Quantum Field Theory, 2nd Edition

edited by

Ralf Hofmann

submission deadline 28 Feb 2025 | 2 articles | Viewed by 2473 | Submission Open

Keywords: ultralight axions; Peccei– Quinn at finite temperature; spectral densities; mixing of Yang– Mills theories; electroweak symmetry breaking; coarse-graining of Euclidean field theory gradient flow cooling

(This special issue belongs to the Section Foundations of Quantum Mechanics and Quantum Gravity)

Neutrino Insights: Peering into the Subatomic Universe

edited by Guillermo D. Megias

submission deadline 28 Feb 2025 | 1 articles | Viewed by 887 | Submission Open

Keywords: neutrino physics; neutrino oscillations; electroweak interactions; CP violation; solar and atmospheric neutrinos; long-baseline accelerators; neutrino-nucleus reactions; low and high energy neutrinos

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Compact Stars in the QCD Phase Diagram 2024

edited by

David Blaschke

, Toru Kojo, Hajime Sotani and Hajime Togashi

submission deadline 28 Feb 2025 | Viewed by 96 | Submission Open

Keywords: neutron stars; neutron star mergers; supernovae; warm; dense QCD; heavy-ion collisions

(This special issue belongs to the Section Compact Objects)

X-ray Astronomy Steps into the 21st Century: Chandra and XMM-Newton at 25

edited by

Eric Schlegel

submission deadline 15 Mar 2025 | Viewed by 362 | Submission Open

Keywords: X-ray astrophysics; high-resolution X-ray imaging; diffraction grating X-ray spectroscopy; active galaxies; X-ray binaries; supernova remnants; normal galaxies; galaxy clusters

(This special issue belongs to the Section Space Science)

Quantum Field Theory in Curved Spacetime and Its Implications for Cosmology, Blackholes and Quantum Gravity

edited by

Korumilli Sravan Kumar

and

Joao Marto

submission deadline 20 Mar 2025 | 8 articles | Viewed by 11294 | Submission Open

Keywords: quantum field theory in curved spacetime; quantum gravity; blackholes; cosmology

(This special issue belongs to the Section Foundations of Quantum Mechanics and Quantum Gravity)

Exploring Double Beta Decay: Probing Fundamental Properties of Neutrinos and Beyond

edited by

Rita Bernabei

submission deadline 31 Mar 2025 | Viewed by 130 | Submission Open

Keywords: experimental and theoretical topics on double beta decay modes; low-background detectors and methodologies; nuclear matrix

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Cosmological Models of the Universe

edited by

Panayiotis Stavrinos

and

Emmanuel N. Saridakis

submission deadline 1 Apr 2025 | 8 articles | Viewed by 7037 | Submission Open

Keywords: standard cosmological model; dark matter; dark energy; bounce cosmology; inflation cosmology; Λ CDM-cosmology; anisotropic cosmology

(This special issue belongs to the Section Cosmology)

Ultra-High-Energy Cosmic Rays

edited by Haoning He

submission deadline 1 Apr 2025 | 1 articles | Viewed by 1168 | Submission Open

Keywords: high energy neutrino; high energy gamma-ray; ultra-high-energy cosmic rays; particle acceleration; hadronic interactions; anisotropy; composition; multi-messenger astronomy; magnetic fields; Gamma-Ray Bursts (GRBs); galaxy clusters; Active Galactic Nuclei (AGN); Tidal Disruption Events (TDEs); radio galaxies; starburst galaxies; pulsars

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Studies of Hadron Spectroscopy at the Future Electron-Hadron and Electron-Ion Colliders

edited by Vladimir Khachatryan and Wenliang Li

submission deadline 15 Apr 2025 | Viewed by 227 | Submission Open

Keywords: quantum chromodynamics; electron scattering; electron-hadron colliders; hadron spectroscopy; conventional & non-conventional hadronic states; photo & electroproduction processes; exclusive & inclusive processes; fragmentation & hadronization

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Planetary Radar Astronomy

edited by

Chunyu Ding

and Yan Su

submission deadline 25 Apr 2025 | 1 articles | Viewed by 2678 | Submission Open

Keywords: radar astronomy; lunar and planetary science; lunar and planetary radar detection; lunar and deep space exploration; radar observations of planets within the solar system; radar observations of planets and stars outside the solar system; Chang’ e-3/-4/-5; Tianwen-1 mission and perseverance rover mission; fast radio bursts magnetar radio emission; radio astronomy; multi-messenger observations

(This special issue belongs to the Section Planetary Sciences)

New Discoveries in Astronomical Data

edited by Yanxia Zhang and

A-Li Luo

submission deadline 30 Apr 2025 | 5 articles | Viewed by 8596 | Submission Open

Keywords: machine learning in astronomy; discoveries: from radio to gamma-rays; deep learning; astrostatistics and astroinformatics; data analysis: methods; statistical: astronomical data bases

(This special issue belongs to the Section Astroinformatics and Astrostatistics)

Current Status of the Hubble Tension

edited by

Giovanni Montani

Eleonora Di Valentino

and Nakia Carlevaro

submission deadline 30 Apr 2025 | 3 articles | Viewed by 2423 | Submission Open

Keywords: Hubble tension; dark matter; dark energy; dark matter/dark energy interaction; quintessence; late universe physics; cosmology from modified gravity; early universe dark energy; model testing; data analysis

(This special issue belongs to the Section Cosmology)

Recent Advances in Gravitational Lensing and Galactic Dynamics

edited by

Francesco De Paolis

Alexander F. Zakharov

and

Luka Č. Popović

submission deadline 30 Apr 2025 | 1 articles | Viewed by 851 | Submission Open

Keywords: gravitational lensing; weak lensing; astrophysics of black holes and neutron stars; gravitational waves; astrophysical tests of general relativity; relativistic astrophysics; galactic dynamics; JWST; EHT; and Euclid observations; exoplanets

(This special issue belongs to the Section Gravitation)

Dark Energy and Dark Matter

edited by Yan Gong

submission deadline 16 May 2025 | 6 articles | Viewed by 6310 | Submission Open

Keywords: dark energy; dark matter; modified gravity; theoretical model; cosmic acceleration; cosmic large-scale structure; gravitational lensing; galaxy clustering; intensity mapping; cosmological constraint

(This special issue belongs to the Section Cosmology)

Measurements, Observations and Theoretical Studies on the Solar Magnetic Field—Celebrating the 40th Anniversary of the Huairou Solar Observing Station

edited by

Shangbin Yang

, Mei Zhang, Junfeng Hou, Jiaben Lin and

Yu Liu

submission deadline 16 May 2025 | 2 articles | Viewed by 1951 | Submission Open

Keywords: solar magnetic field; solar polarimetry; multi-wavelength diagnostic; topology analysis; astroinformatics; MHD; solar dynamo; space weather forecasting; solar historical data; space projects

(This special issue belongs to the Section Solar and Stellar Physics)

Current Trends in Neutrino Oscillation Physics: A Phenomenological and Experimental Perspective

edited by

Monojit Ghosh

and Budimir Kliček

submission deadline 20 May 2025 | 1 articles | Viewed by 908 | Submission Open

Keywords: neutrino oscillation; three flavour oscillation; beyond three flavour oscillation; models for neutrino mass and mixing; neutrino experiments; neutrino detectors; neutrino interactions

Probing the Early Universe

edited by

Øyvind Grøn

submission deadline 31 May 2025 | 3 articles | Viewed by 3256 | Submission Open

Keywords: the Planck era (t < 10-43 s); grand unification era (t < 10-36 s); the inflationary era (t < 10-33 s); electroweak epoch (10-33 s < t < 10-12 s); quark era (10-12 s < t < 10-5 s); hadron era (10-5 s < t < 1 s); lepton era with neutrino decoupling (1 s < t < 10 s); cosmic nucleosynthesis (10 s < t < 1000 s); radiation dominated and ‘ foggy’ era (1000 s < t < 380; 000 years); recombination (18; 000 years < t < 380; 000 years); the dark era (380; 000 years < t < 150 million years); first stars and galaxies (200 to 400 million years); cosmic reionization (200 million to 1 billion years)

(This special issue belongs to the Section Cosmology)

A Multiwavelength View of Supernovae

edited by

Vikram Dwarkadas

submission deadline 31 May 2025 | Viewed by 312 | Submission Open

Keywords: supernovae; core collapse; type Ia; binaries; evolution; circumstellar interactions; emission processes; thermal and non-thermal emission

(This special issue belongs to the Section Solar and Stellar Physics)

Modified Gravity and Dark Energy Theories

edited by Changjun Gao

submission deadline 31 May 2025 | Viewed by 106 | Submission Open

Keywords: dark energy; modified gravity theories; black hole solutions; exact solutions; black hole thermodynamics; nature of spacetime; black hole physics; gravitational waves in modified gravity theories

(This special issue belongs to the Section Gravitation)

Applications of Artificial Intelligence in Modern Astronomy

edited by Bo Qiu

submission deadline 31 May 2025 | Viewed by 87 | Submission Open

Keywords: artificial intelligence; machine learning; astronomy; deep learning; big data; telescope

(This special issue belongs to the Section Astroinformatics and Astrostatistics)

A Multimessenger View of Supermassive Black Holes and the Quasar Main Sequence

edited by

Ascension Del Olmo

and

Paola Marziani

submission deadline 1 Jun 2025 | 7 articles | Viewed by 12241 | Submission Open

Keywords: quasars; active galactic nuclei; supermassive black holes; quasar main sequence

(This special issue belongs to the Section Galaxies and Clusters)

Advances in Nuclear Astrophysics

edited by Ragandeep Singh Sidhu, Gavin Lotay and Jaspreet Singh Randhawa

submission deadline 15 Jun 2025 | Viewed by 267 | Submission Open

Keywords: nuclear astrophysics; observational astronomy; nuclear physics; stellar evolution; experimental techniques; fundamental properties

(This special issue belongs to the Section High Energy Nuclear and Particle Physics)

Loop Quantum Gravity and Non-Perturbative Approaches to Quantum Cosmology, Second Edition

edited by

Gerald B. Cleaver

submission deadline 20 Jun 2025 | 3 articles | Viewed by 2324 | Submission Open

Keywords: quantum gravity; non-perturbative approaches; planck scale; supergravity; non-commutative geometry; loop quantum gravity; loop quantum cosmology; string theory; emergent gravity; Horava-Lifshitz gravity

(This special issue belongs to the Section Cosmology)

Experimental and Observational Constraints on Wormhole Models

edited by João Luís de Figueiredo Rosa

submission deadline 20 Jun 2025 | Viewed by 135 | Submission Open

Keywords: wormholes; compact objects; experimental gravitational physics; model testing and constraining; exotic matter; modified theories of gravity; energy conditions

Studying Astrophysics with High-Energy Cosmic Particles

edited by Kinwah Wu and

Ellis R. Owen

submission deadline 30 Jun 2025 | 2 articles | Viewed by 2230 | Submission Open

(This special issue belongs to the Section Cosmology)

Variable Stars in the 21st Century: From Microvariability to Megavariability

edited by

Laszlo Szabados

and Tamas Szalai

submission deadline 30 Jun 2025 | 1 articles | Viewed by 375 | Submission Open

Keywords: stellar variability; sky surveys; time-domain astrophysics; astrophysical transients; individual variable stars

(This special issue belongs to the Section Solar and Stellar Physics)

Tensions, Anomalies, and Challenges in the Standard Cosmological Model

edited by

John P. Ralston

and Pavan Kumar Aluri

submission deadline 30 Jun 2025 | Submission Open

Keywords: standard cosmological model— anomalies; tensions; challenges; cosmological principle; Hubble tension; S8 tension; dark matter and dark energy; early- and late-time probes

(This special issue belongs to the Section Cosmology)

The First Stars: Keys to Understanding Dark Matter

edited by

Øyvind Grøn

submission deadline 25 Jul 2025 | Viewed by 105 | Submission Open

Keywords: dark matter; first stars; early universe; WIMPs (weakly interacting massive particles); James Webb Space Telescope

(This special issue belongs to the Section Cosmology)

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