Universe

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 policies 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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Hairy Black Holes: Insights and Advances

edited by

Xiao Yan Chew

and Jose Luis Blázquez-Salcedo

submission deadline 30 Jun 2026 | Viewed by 103 | Submission Open

Keywords: hairy black holes; general relativity; modified gravity; gravitational waves; black hole shadows; quantum gravity; no-hair theorem; numerical relativity; dark matter models; Event Horizon Telescope

(This special issue belongs to the Section Compact Objects)

Ultralight Dark Matter: Theory and Observation

edited by Arnab Dasgupta

submission deadline 30 Jun 2026 | Viewed by 77 | Submission Open

Keywords: ultralight dark matter; bosonic fields; coherent field; axion; ALP; fuzzy dark matter

(This special issue belongs to the Section Cosmology)

HE/VHE Gamma-Ray in Extragalactic-Astrophysics: Observations, Models, and Cosmic Implications

edited by

Zhiyuan Pei

and

Hubing Xiao

submission deadline 30 Jun 2026 | Viewed by 71 | Submission Open

Keywords: HE/VHE gamma-ray observations; active galactic nucleus; gamma-ray bursts; gamma-ray propagation; cosmic rays; EBL attenuation

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

Selected Papers from the 3rd International Online Conference on Universe (IOCU 2026)

edited by

and

submission deadline 20 Jul 2026 | Viewed by 47 | Submission Open

Keywords: gravitation and cosmology; quantum gravity and field theory; high-energy nuclear and particle physics; foundations of quantum mechanics; space and planetary sciences; galaxies; clusters and compact objects; solar and stellar physics

Advances in Machine Learning Techniques in Cosmology and Particle Physics

edited by Esteban González and

Carlos Maldonado

submission deadline 31 Jul 2026 | Viewed by 57 | Submission Open

Keywords: cosmology; particle physics; machine learning; deep learning; data analysis

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

Active Galactic Nuclei: Accretion and Supermassive Black Holes

edited by Edi Bon and

Nataša Bon

submission deadline 31 Jul 2026 | Viewed by 54 | Submission Open

Keywords: active galactic nuclei (AGN); accretion disks; supermassive black holes (SMBH); broad-line region (BLR); dusty torus; AGN unification (type 1 and type 2); changing-look AGN; radius– luminosity relation; black hole mass scaling; quasar main sequence (eigenvector 1); supermassive binary black holes; quasar cosmology

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

X-Ray Binary Transients: Insights and Discoveries

edited by Ignacio Negueruela

submission deadline 21 Aug 2026 | Viewed by 4 | Submission Open

Keywords: X-ray binaries; transient astrophysics; accretion physics; compact objects; time-domain astronomy

(This special issue belongs to the Section Compact Objects)

Astroinformatics and Big Data in Astronomy

edited by

Haijun Tian

submission deadline 31 Aug 2026 | Viewed by 69 | Submission Open

Keywords: astroinformatics; astronomical big data; machine and deep learning; artificial intelligence; data processing and visualization in astronomy; statistical inference; virtual observatory; scientific discovery

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

Neutral Hydrogen Observations: Techniques and Cosmological Insights

edited by

Yougang Wang

and

Yichao Li

submission deadline 31 Aug 2026 | Viewed by 44 | Submission Open

Keywords: neutral hydrogen intensity mapping; neutral hydrogen galaxy; neutral hydrogen absorber; large-scale structure; galaxy dynamics; galaxy and galaxy clusters

(This special issue belongs to the Section Cosmology)

Supernova Remnants in the Multi-Wavelength Era

edited by

Daniel Patnaude

submission deadline 1 Sep 2026 | Viewed by 78 | Submission Open

Keywords: supernovae; supernova remnants; cosmic rays; explosion mechanisms; dust; stellar evolution; ISM; CSM; pulsar wind nebulae; compact remnants

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

Exploring the Formation and Impact of Type Ia Supernovae

edited by Umberto Battino, Benjamin Rose and Robert Izzard

submission deadline 25 Sep 2026 | 1 articles | Viewed by 724 | Submission Open

Keywords: light curves; supernovae; nucleosynthesis; nuclear reactions; galactic chemical evolution; supernova remnants; cosmic expansion

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

Neutrino Oscillations and Interactions

edited by

Oleksandr Tomalak

submission deadline 30 Oct 2026 | Viewed by 140 | Submission Open

Keywords: neutrino oscillation parameters; PMNS matrix; neutrino interactions; neutrino mass hierarchy; charge-parity (CP) violation

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

Advances in Quantum Gravity: Unifying Symmetry and Spacetime

edited by

César Augusto Zen Vasconcellos

Peter Otto Hess

and

Fridolin Weber

submission deadline 30 Nov 2026 | Viewed by 151 | Submission Open

Keywords: quantum groups and non-commutative spacetime; loop quantum gravity and spin foams; Hořava– Lifshitz gravity and asymptotic safety; Lifshitz gravity and asymptotic safety; string theory; holography; and generalized symmetries; emergent gravity and quantum foundations; phenomenology and observational frontiers

(This special issue belongs to the Section Gravitation)

Oscillations and Instabilities of Solar Filaments

edited by

Yuandeng Shen

and

Qingmin Zhang

submission deadline 31 Dec 2026 | 1 articles | Viewed by 472 | Submission Open

Keywords: solar filaments; solar prominences; filament oscillations; MHD waves; coronal seismology; filament instabilities; solar eruptions; coronal mass ejections (CMEs)

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

Thermal, Dynamic and Magnetic Properties of Solar Jets

edited by Ruisheng Zheng, Jiajia Liu and

Qingmin Zhang

submission deadline 31 Dec 2026 | Viewed by 107 | Submission Open

Keywords: solar jets; coronal mass ejections; solar flares; solar activities; magnetic fields; magnetic reconnection; particle acceleration

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

Challenges in Evolutionary Mechanisms in Nearby Galaxies: Resolving Problems from Dwarfs to BCGs

edited by

Hassen Yesuf

submission deadline 31 Dec 2026 | Viewed by 79 | Submission Open

Keywords: spatially resolved analysis; star formation; feedback; baryon cycle; nuclear activity; galaxy environment

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

Displaying special issue 51-100 on page 2 of 2.

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