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The following outline is provided as an overview of and topical guide to astronomy: Astronomy – studies the universe beyond Earth, including its formation and development , and the evolution, physics , chemistry , meteorology , and motion of celestial objects (such as galaxies , planets , etc.) and phenomena that originate outside the ...
Astronomy is a natural science that studies celestial objects ... Related topics; ... In the 21st century there remain important unanswered questions in astronomy.
This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.
Radio astronomy – >300 μm; Submillimetre astronomy – 200 μm to 1 mm; Infrared astronomy – 0.7–350 μm; Optical astronomy – 380–750 nm; Ultraviolet astronomy – 10–320 nm; High-energy astronomy. Cosmic ray astronomy - charged particles with very high kinetic energy; X-ray astronomy – 0.01–10 nm; Gamma-ray astronomy – <0.01 nm
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a ...
From planetary meet-ups to the first total lunar eclipse in three years, here are the top astronomy events to look for throughout 2025: Stellar views of Mars will greet stargazers in January as ...
High: Important topics of widespread interest in astronomy; major divisions of top-importance topics. Examples: Parallax, Stellar evolution, Amateur astronomy. Mid: Subdivisions within astronomy; topics which may be taught to university students but are not otherwise widely known. Examples: Magnetosphere, Orbital resonance, Lagrange point
The inflationary theory as an augmentation to the Big Bang theory was first proposed by Alan Guth of MIT. Inflation solves the 'horizon problem' by making the early universe much more compact than was assumed in the standard model. Given such smaller size, causal contact (i.e., thermal communication) would have been possible among all regions of the early universe. The image was an adaptation ...