Science AI Journal
Physics and Astronomy · Research topic

Open research questions in Astro and Planetary Science

442 gap statements mined from Astro and Planetary Science papers in our 7.9M-paper local library, which holds 4,096 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.

Choosing where to publish on Astro and Planetary Science? See the ranked Physics journals.

What the literature leaves open

  • Future work could focus on producing UV tholins thick enough to directly probe their true intrinsic surface energy, whose values reported here are probably affected by the substrate underneath. This conclusion, however, should be treated with caution, as the intrinsic surface energies of the ultrathin UV tholin samples remain uncertain.

    A Cross-laboratory Comparison Study of Titan Haze Analogs: Surface Energy II · 2026 · DOI

  • Since most orbital solutions derived from our two-epoch detections (Sample B) remain insufficiently constrained, we limit our compositional estimates only to the three-epoch detections (Sample A).

    The Luminosity Function of Ultrafaint Trans-Neptunian Objects Detected by JWST · 2026 · DOI

  • Further research on the characteristics of scattered beams and the evolution of auroral beams is necessary to better understand their generation process.

    Auroral Acceleration Generates Electron Beams in Jupiter's Middle Magnetosphere · 2026 · DOI

  • Computing this response for embedded perturbers is a step toward computationally efficient models of commonenvelope and planetary-engulfment inspirals, but several ingredients remain to be added.

    Dynamical friction in stratified stellar envelopes · 2026 · DOI

  • The origins, relative abundances, and molecular properties of this organic material remain incompletely characterized, and filling this knowledge gap will likely be the focus of future robotic missions.

    Enceladus: Exploring a Habitable Ocean Beyond Earth · 2026 · DOI

  • The analysis presented in this paper does not account for uncertainties related to the transfer, such as errors in estimating the properties of the reflective membrane or the influence of orbital perturbations.

    Using Solar Sails to Rendezvous with Asteroid 2024 YR4 · 2025 · DOI

  • However, experimental studies of how radiative heating modifies the physical properties of carbonaceous asteroid surfaces remain scarce compared with studies of thermally induced changes in mineral composition and the resulting spectral alterations.

    Experimental evidence for a physical alteration of fine regolith on near-Sun asteroids · 2026 · DOI

  • Age-composition relationships for TiO 2, Mg#, and LP-GRS-derived Th abundance do not define a simple monotonic evolutionary sequence, suggesting that model age alone is insufficient to fully account for the geochemical variability of farside mare basalts.

    Chronology, geochemistry, and tectonic controls of lunar farside mare basalts from multisource remote sensing data · 2026 · DOI

  • Consequently, comparisons between observations and theoretical predictions are often limited to an order of magnitude level. While qualitative conclusions have been drawn for specific MMRs in the past, a unified quantitative comparison is lacking. Lastly, and most importantly, the current observational data on TNOs remain relatively scarce, particularly for resonant TNOs.

    Numerical estimation of the capture ability of Neptunian mean motion resonances · 2026 · DOI

  • Future research should investigate the effects of condensation of clouds on the geometric albedos of hot Jupiters. Future research should explore the use of more complex models that account for the effects of atmospheric chemistry on the geometric albedos of hot Jupiters.

    The effect of atmospheric chemistry on the optical geometric albedos of hot Jupiters · 2026 · DOI

  • There is a lack of understanding of the effects of atmospheric chemistry on the geometric albedos of hot Jupiters. There is a need for a comprehensive sample of observed geometric albedos of hot Jupiters.

    The effect of atmospheric chemistry on the optical geometric albedos of hot Jupiters · 2026 · DOI

  • The lack of information about the dynamical, chemical, and thermophysical properties of these objects. The development of new methods for detecting atmospheres is necessary.

    Detection of an atmosphere on a trans-Neptunian object beyond Pluto · 2026 · DOI

  • The dynamical, chemical, and thermophysical properties of 2002 XV93 are highly uncertain. The construction of a detailed atmosphere refraction model is difficult due to the lack of information. The study is limited by the availability of observational data.

    Detection of an atmosphere on a trans-Neptunian object beyond Pluto · 2026 · DOI

  • Little is known about the evolution of hazes in their environment once formed. The effects of hydrolysis on haze optical properties are not well understood. There is a need for physically informed haze optical properties in models.

    Hydrolyzed Hazes on Water-rich Exoplanets: Optical Constants and Detectability · 2026 · DOI

  • The need to correct for atmospheric reddening and flux calibration biases.

    On the Origin of Sodium Atoms in the Comae and Trails of Comets · 2026 · DOI

  • The study does not provide a detailed analysis of the limitations of the proposed approach. The use of machine learning and deep learning models may be limited by the quality and quantity of the training data.

    Long-term Dynamical Evolution and Ejection of Near-Earth Asteroids · 2026 · DOI

  • The study identifies a gap in the current understanding of asteroid ejection dynamics and the need for efficient and scalable approaches to classify long-term dynamical outcomes. The paper highlights the limitations of traditional machine learning models and the need for novel approaches to leverage recurrence plots derived from short-term dynamical trajectories.

    Long-term Dynamical Evolution and Ejection of Near-Earth Asteroids · 2026 · DOI

  • The reaction rates of the termolecular reactions in the final step of DMS or DMDS formation are not measured or computed. The energy barrier of the catalytic H-abstraction reaction is not experimentally measured. The study is limited to the atmosphere of K2-18b as a case study.

    Organosulfur Chemistry on Sub-Neptunes: Implications for Hazes and Biosignatures · 2026 · DOI

  • Quantum chemical calculations of the catalytic H-abstraction reaction will be crucial to ascertain if DMS is still to be considered a biosignature gas. Further study of the reaction rates of the termolecular reactions in the final step of DMS or DMDS formation is needed. The study of the atmospheres of other sub-Neptune exoplanets is needed to understand the variability of haziness.

    Organosulfur Chemistry on Sub-Neptunes: Implications for Hazes and Biosignatures · 2026 · DOI

  • The origin of the new molecules detected in Jupiter's stratosphere after the comet collision is still not completely understood. There is a lack of understanding of the isotopic composition of these molecules. The paper seeks to address this gap by measuring carbon and nitrogen isotopic ratios in HCN.

    New 12C/13C and 14N/15N isotopic ratios measurements in HCN in the Jupiter stratosphere revealed by ALMA · 2026 · DOI

  • This could, for example, detect long term variations in the mass ejection rate of Enceladus' plumes, which the neutral model does not account for.

    Soft X‐Ray Emission From Saturn's Magnetosheath Part I: 3D Modeling From MHD Data · 2026 · DOI

  • Development of more complex atmospheric models that include the effects of hydrolysis.

    Hydrolyzed Hazes on Water-rich Exoplanets: Optical Constants and Detectability · 2026 · DOI

  • Further study of the resonance mechanism between Pluto and Neptune. Exploration of the practical implications of Pluto's orbital resonance for deep space missions. Investigation of the effects of Pluto's orbital characteristics on the dynamics of the Kuiper Belt.

    From Orbital Physics to Formation Mechanisms: A Review of Pluto and Its Relevance for Space Missions · 2026 · DOI

  • Further study of the alkali emissions in spectra of comets, - Investigation of the efficiency of sodium-phenoxide carbonylation with respect to sodium photodesorption, - Analysis of the trail mininuclei…

    On the Origin of Sodium Atoms in the Comae and Trails of Comets · 2026 · DOI

  • Further measurements of the isotopic composition of HCN and other exogenic species, - Investigation of the high pressure or temperature chemistry of the shock, - Study of the history of HCN and its isotopologues in the Jovian…

    New 12C/13C and 14N/15N isotopic ratios measurements in HCN in the Jupiter stratosphere revealed by ALMA · 2026 · DOI

Most-cited papers in Astro and Planetary Science

Most recent work

Find a gap in your own Astro and Planetary Science sub-topic

This page shows what the Astro and Planetary Science literature already flags as unresolved. To narrow it to your specific question, search the Research Gap Finder: the search is free with a free account and lists the papers closest to your topic first. Unlocking that topic (50 credits, charged once) fills the comparison table from our 7.9M-paper local library and writes the gaps from its rows.

Open the Research Gap Finder →

Related topics in Physics and Astronomy

Galaxies: Formation, Evolution, Phenomena
888 open questions
Stellar, planetary, and galactic studies
838 open questions
Model Reduction and Neural Networks
830 open questions
Cosmology and Gravitation Theories
696 open questions
Quantum Information and Cryptography
618 open questions
Advanced Radiotherapy Techniques
473 open questions
Pulsars and Gravitational Waves Research
462 open questions
Black Holes and Theoretical Physics
436 open questions
Open questions raised by papers listed on this page include: (1) Future work could focus on producing UV tholins thick enough to directly probe their true intrinsic surface energy, whose values reported here are probably affected by the substrate underneath (“A Cross-laboratory Comparison Study of Titan Haze Analogs: Surface Energy II”, 2026); (2) Computing this response for embedded perturbers is a step toward computationally efficient models of commonenvelope and planetary-engulfment inspirals, but several ingredients remain to be added (“Dynamical friction in stratified stellar envelopes”, 2026); (3) The origins, relative abundances, and molecular properties of this organic material remain incompletely characterized, and filling this knowledge gap will likely be the focus of future robotic missions (“Enceladus: Exploring a Habitable Ocean Beyond Earth”, 2026); (4) Experimental studies of how radiative heating modifies the physical properties of carbonaceous asteroid surfaces remain scarce compared with studies of thermally induced changes in mineral composition and the resulting spectral alterations (“Experimental evidence for a physical alteration of fine regolith on near-Sun…”, 2026); (5) While qualitative conclusions have been drawn for specific MMRs in the past, a unified quantitative comparison is lacking (“Numerical estimation of the capture ability of Neptunian mean motion resonances”, 2026). 442 gap statements have been mined from Astro and Planetary Science papers in our 7.9M-paper local library, which holds 4,096 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.

Tools for your next paper

Gaps & Literature SearchFind open questions in any field — 1,100,000+ open gaps mined from our own library.Pre-CheckIs your paper ready? Acceptance odds for top, mid and open/emerging journals, in seconds.Journal FinderA ranked shortlist of target journals from a 17,500-venue index.Duplicate Publication CheckerCheck for prior publication across 7 sources and our local library.Citation GeneratorFreeA DOI or title → APA, MLA, Vancouver, Chicago, BibTeX, RIS. No signup.Graphical Abstract MakerFreeTurn your findings into a colorblind-safe graphical abstract.

How Pre-Check worksHow AI Review works

Compare the category — Honest roundups of the AI research tools, ours listed alongside the alternatives.

Command palette

Jump anywhere, run any action.