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Everything about Observable universe
All of space observable from the Earth at the present
The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth; the electromagnetic radiation from these astronomical objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion. The radius of this region is about 14.26 gigaparsecs (46.5 billion light-years or 4.40×1026 m). Wikipedia →
🧭 Start here: a 6-step reading path
- Read the overview: Observable universeA 5-minute orientation
- Skim a recent paper: Is the observable Universe consistent with the cosmological principle?Influential work since 2022
- Pick up a classic book: A star atlas and telescopic handbookThe most-reprinted book on the subject
- Read the landmark paper: Planning and acting in partially observable stochastic domainsCited 2,676 times
- Go sideways: UDFy-38135539A closely related topic
- Go sideways: Expansion of the universeA closely related topic
📖 Definitions
Adjective Able to be observed.
Adjective Deserving to be observed; worth regarding; remarkable.
Noun Any physical property that can be observed and measured directly and not derived from other properties.
🏆 Landmark papers (most cited)
Planning and acting in partially observable stochastic domains
Predictions for the rates of compact binary coalescences observable by ground-based gravitational-wave detectors
The Optimal Control of Partially Observable Markov Processes over a Finite Horizon
MgZnCa glasses without clinically observable hydrogen evolution for biodegradable implants
Fluctuation theorems: Work is not an observable
State of the Art—A Survey of Partially Observable Markov Decision Processes: Theory, Models, and Algorithms
Robustness of Coherence: An Operational and Observable Measure of Quantum Coherence
A New Concept Linking Observable Stable Isotope Fractionation to Transformation Pathways of Organic Pollutants
🆕 Influential since 2022
Is the observable Universe consistent with the cosmological principle?
Partially Observable Markov Decision Processes in Robotics: A Survey
Window observable for the hadronic vacuum polarization contribution to the muon g−2 from lattice QCD
Partially Observable Markov Decision Processes and Robotics
Multi-UAV Navigation for Partially Observable Communication Coverage by Graph Reinforcement Learning
📚 Books worth reading
A star atlas and telescopic handbookArthur P. Norton, J. Gall Inglis · 1910
The Magic ChristianTerry Southern · 1959
Classroom ObservationMatt O'Leary · 2013
Stars and Planets (Smithsonian Handbooks)Ian Ridpath · 1978
Seeing young childrenWarren R. Bentzen · 1985
Observing development of the young childJanice J. Beaty · 1986
NightwatchTerence Dickinson · 1983
The sky observer's guideR. Newton Mayall, Margaret W. Mayall · 1958
Ranked by number of editions on Open Library, a rough measure of how lasting a book is.
🔗 Related topics
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- Particle horizon The particle horizon (also called the cosmological horizon, the comoving horizon, or the cosmic light horizon) is the maximum distance from which light…
- Distance measure Distance measures are used in physical cosmology to generalize the concept of distance between two objects or events in an expanding universe. They may…
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- Cosmological horizon A cosmological horizon is one of two boundaries in three dimensional space, the particle horizon or the event horizon. The particle horizon divides space…
- GN-z11 GN-z11 is a high-redshift galaxy discovered by NASA's Hubble Space Telescope in the constellation Ursa Major. It is among the farthest galaxies from Earth…
- Hubble's law Hubble's law, officially the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional…