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Open research questions in Astronomy and Astrophysical Research

70 gap statements mined from Astronomy and Astrophysical Research papers in our 4.5M-paper local library, which holds 604 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The radial extent estimates of the SiO and SiS abundance profiles increase with circumstellar gas density as expected, though the observed trends are limited by the large uncertainties on the derived values for AFGL 3068.

    Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars. III. SiO and SiS abundances · 2026 · DOI

  • Because the origin and shape of this correction is not well known, we choose to provide both the corrected and uncorrected cubes so that users can test whether the IO light matters for their use case.

    SIMLA: The Spitzer Infrared Spectrograph Mapping Legacy Archive · 2026 · DOI

  • Further study of the s-process nucleosynthesis in O- and C-rich evolved stars is needed. Investigation of the simultaneous increase of carbon and s-process elements. Development of theoretical AGB models that can reproduce the observed abundances.

    Tracing the s-process: spectroscopic insights into chemical abundances in O- and C-rich evolved stars · 2026 · DOI

  • Describing the galaxy as a stationary structure, eliminating the need for time-dependent processes. Providing a stable galaxy model without dark matter.

    QUINT‑DENSE Galaktische System‑Simulation Version 2.2 · 2026 · DOI

  • First, the parameters α,, γ, η were optimised for NGC 7793; their universality across, a larger sample of late-type galaxies remains to be tested.

    Modified Quantum Gravitational Theory Applied to The Rotation Curve of NGC 7793: A Gas-Coupled Quantum Alternative Explaining The Bosma Effect · 2026 · DOI

  • The paper identifies a need for a framework that can predict harmonic register families for various attributes.

    KishLattice Geometric Harmonic Spectroscopy: Volume 11 Pre-Registration (Multi-Attribute Sovereign Lake Expansion & Dimensionality Falsification Protocol) · 2026 · DOI

  • Current UV space-based instrumentation lacks the spatial resolution and sensitivity required to fully address the problem. The COS throughput sensitivity drops by roughly two-orders of magnitude below 1100 Å. Contamination from Milky Way absorption is a problem at low redshifts.

    Resolving the origins and pathways of ionizing radiation escape with UV integral field spectroscopy · 2026 · DOI

  • Future surveys can build on the CEERS survey's methods and results. Future studies can use the CEERS survey's catalog to investigate galaxy evolution. Future research can focus on improving photometric redshifts and SED fitting.

    The CEERS Photometric and Physical Parameter Catalog · 2026 · DOI

  • The study of RCL AGNs is challenging due to the need for multiepoch spectroscopic data and MIR light curves. The selection of RCL AGNs requires careful visual inspection and selection criteria. The estimation of BH masses and MIR variability timescales is subject to substantial uncertainties.

    Discovery of Repeating Transitions in 16 Changing-look Active Galactic Nuclei · 2026 · DOI

  • The complexity of the cosmic web and the need for novel approaches to capture its properties. The degeneracy between σ_8 and Ω_m and the need for methods to break it. The limited volume and resolution of current simulations.

    The network analysis of the cosmic web as a tool to constrain cosmology and cosmic magnetism · 2026 · DOI

  • The analysis of the impact of feedback effects from star formation and active galactic nuclei is deferred to future work. The study suggests investigating the ability of network centrality statistics to break the σ_8-Ω_m degeneracy. The paper proposes applying the network analysis approach to larger volumes and more complex simulations.

    The network analysis of the cosmic web as a tool to constrain cosmology and cosmic magnetism · 2026 · DOI

  • Future high-resolution interferometric observations are necessary to distinguish between the tidal and RELHIC scenarios. Further study of the HI clouds and their properties is needed.

    A RELHIC twin candidate near the galaxy M51 · 2026 · DOI

  • The lack of a common set of microphysics routines for astrophysical simulation codes built around the AMReX library. The need for a library that can take advantage of GPU-offloading and is suitable for exascale compute architectures.

    AMReX-Astrophysics Microphysics: A set of microphysics routines for astrophysical simulation codes based on the AMReX library · 2026 · DOI

  • Lack of a unified framework for delivering atmospheric parameters and chemical abundances on a single scale.

    Homogeneous Stellar Parameters from Heterogeneous Spectra with Deep Learning · 2026 · DOI

  • Two directions for future work are particularly promising. First, real survey data often contain incomplete or unreliable physical parameters, irregular cadence, heterogeneous photometric precision, observational noise, and partially missing catalog information.

    Reframing Variable Star Classification as Structured Sequence Modeling with Large Language Models · 2026 · DOI

  • Omega Centauri ( ω Cen) is the most massive and chemically complex star cluster in the Milky Way (MW) and is widely interpreted as the surviving nuclear star cluster of an accreted dwarf galaxy, although the identity of its parent remains uncertain.

    oMEGACat. X. Shedding Light on the Disrupted Dwarf Galaxy of Omega Centauri · 2026 · DOI

  • The increasing volumes of astronomical data require new analysis methodologies. The bottleneck in astronomical machine learning projects is shifting from model design to infrastructure.

    Hyrax: An Extensible Framework for Rapid ML Experimentation and Unsupervised Discovery in the Era of Rubin, Roman, and Euclid · 2026

  • To explore the implications of the Licht-Gravitationstheorie (LGT) for our understanding of galaxy physics.

    QUINT‑DENSE Galaktische System‑Simulation Version 2.2 · 2026 · DOI

  • The appropriate value of Γ to use is not well defined and therefore we test a variety of values with ASPECS-6 to check how the result depends on the choice of Γ.

    PAHSPECS: Spatially Resolved PAH Spectroscopy at Cosmic Noon with JWST MIRI MRS · 2026 · DOI

  • Existing approaches to estimate redshifts from galaxy spectra rely on limited hand-curated external template data. These approaches have limited performance due to model mismatch error.

    Robust joint estimation of galaxy redshift and spectral templates using online dictionary learning · 2026 · DOI

  • One limitation of the current SyFu algorithm is that both the imager and the IFU must observe the same FoV with complete spatial and spectral overlap…

    Fusion of JWST data: Demonstrating practical feasibility · 2026 · DOI

  • Further study of the Galactic Center and star formation. Continued use of the ALMA Observatory to study the Central Molecular Zone. Investigation of the role of the supermassive black hole in star formation.

    Galactic Center Newsletter (Vol.XXIX / No.4) · 2026 · DOI

  • The MIR variability timescales carry additional dispersion from dust reprocessing, while the BH masses estimated from SE virial methods also carry substantial uncertainties.

    Discovery of Repeating Transitions in 16 Changing-look Active Galactic Nuclei · 2026 · DOI

  • Applying the framework to forthcoming spectroscopic surveys such as SDSS-V, WEAVE, and 4MOST - Interpretation of labels by downstream…

    Homogeneous Stellar Parameters from Heterogeneous Spectra with Deep Learning · 2026 · DOI

  • To develop convergence criteria for the algorithm. To update the algorithm to use measured instrument passbands. To refine the equations to optimally treat the case of passbands with unequal noise.

    Robust joint estimation of galaxy redshift and spectral templates using online dictionary learning · 2026 · DOI

Most-cited papers in Astronomy and Astrophysical Research

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Open questions raised by papers listed on this page include: (1) Further study of the s-process nucleosynthesis in O- and C-rich evolved stars is needed (“Tracing the s-process: spectroscopic insights into chemical abundances in O-…”, 2026); (2) The parameters α,, γ, η were optimised for NGC 7793; their universality across, a larger sample of late-type galaxies remains to be tested (“Modified Quantum Gravitational Theory Applied to The Rotation Curve of NGC…”, 2026); (3) Future studies can use the CEERS survey's catalog to investigate galaxy evolution (“The CEERS Photometric and Physical Parameter Catalog”, 2026); (4) Further study of the HI clouds and their properties is needed (“A RELHIC twin candidate near the galaxy M51”, 2026); (5) The lack of a common set of microphysics routines for astrophysical simulation codes built around the AMReX library (“AMReX-Astrophysics Microphysics: A set of microphysics routines for…”, 2026). 70 gap statements have been mined from Astronomy and Astrophysical Research papers in our 4.5M-paper local library, which holds 604 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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