Astronomy and cosmology
For everyone
The field that studies celestial bodies and the universe as a whole. The sky has been observed for thousands of years for calendars, agriculture and navigation. Telescopes, spectroscopy and spacecraft have radically changed our knowledge of the age, size and contents of the universe. Religions and science give different accounts of the beginning of the universe.
For specialists
The standard cosmological model (ΛCDM) holds that about 5% of the universe's energy content is ordinary matter, 27% dark matter and 68% dark energy, based on measurements of the cosmic microwave background. The tension between values of the Hubble constant measured by different methods, and DESI data hinting that dark energy may change over time, are current tests of the model.
Claims
- According to Planck satellite data, about 68% of the universe's energy content is dark energy, 27% dark matter and 5% ordinary matter.[1]
Connections
New research in this branch
Notable in peer-reviewed journals
- Nonlinear interaction of three impulsive gravitational waves I: Main result and the geometric estimates — Jonathan Luk, Maxime Van de Moortel · 2026-10-01 · American Journal of Mathematics
- Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) — Jes Kristian Jørgensen, A. Coutens, M. N. Drozdovskaya et al. · 2026-10-01 · Astronomy and Astrophysics
- Genetic encoding and mutagenesis of RNA droplet phenotypes — William Verstraeten, Mai P. Tran, Alena Taskina et al. · 2026-10-07 · Nature Chemical Engineering
- Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) — Adele Plunkett, S. Maret, D. Harsono et al. · 2026-10-01 · Astronomy and Astrophysics
Preprints (may not be peer-reviewed yet)
- The $δ$ Scuti instability strip and period-luminosity relation as seen by TESS and Gaia DR3 — Daniel Hey, Simon Murphy, Timothy R. Bedding et al. · 2026-10-29 · arXiv
- PRISMS GHZ8: Evidence for a Young Burst and Potential Merger Activity at z=10.23 — Ruqiu Lin, Jorge Zavala, Javier Álvarez-Márquez et al. · 2026-10-29 · arXiv
- Gravitational-Wave Echoes and Greybody Cutoff from Logarithmic Throats at a Marginal-Trapping Threshold — Jahed Abedi · 2026-10-29 · arXiv
- Field-level inference under pressure: the information content of the thermal Sunyaev-Zel'dovich field — Carmen Embil Villagra, Adrian E. Bayer, William R. Coulton et al. · 2026-10-29 · arXiv
Sources
- Article (2020). Planck 2018 results. VI. Cosmological parameters. Astronomy & Astrophysics 641, A6DOI 10.1051/0004-6361/201833910archive
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Cite this page
Athena contributors. (2026). Astronomy and cosmology. Athena: The tree of human knowledge. Retrieved November 1, 2026, from https://latifkedi.github.io/athena/en/d/astronomi/
@misc{athena_astronomi,
title = {Astronomy and cosmology},
author = {{Athena contributors}},
year = {2026},
howpublished = {\url{https://latifkedi.github.io/athena/en/d/astronomi/}},
note = {Athena: The tree of human knowledge. Accessed: 2026-11-01}
}Added: September 27, 2026 · Last changed: September 27, 2026 · Page history