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For the journal, see The Astrophysical Journal.

NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light-years in diameter and approximately 60 million light-years distant.

Physics
Mass–energy equivalence

History of physics
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Statistical mechanics · Thermodynamics
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2-degree-Field Galaxy Redshift Survey
2-Micron All-Sky Survey (2MASS)
Bell test · BOOMERanG · Camera obscura experiments · Cavendish experiment · Cosmic Background Explorer (COBE) · Davisson-Germer · Double slit · Foucault pendulum · Franck Hertz · Gravity Probe A · Gravity Probe B · Geiger–Marsden · Homestake experiment · Oil-drop experiment · Michelson-Morley · Neutrino experiment · Sloan Digital Sky Survey · Stern-Gerlach · Wilkinson Microwave Anisotropy Probe

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Relativistic Heavy Ion Collider
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Astrophysics (Greek: Astro - meaning "star", and Greek: physis – φ?σις - meaning "nature") is the branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects, as well as their interactions and behavior.[1] Among the objects studied are galaxies, stars, planets, exoplanets, the interstellar medium and the cosmic microwave background. Their emissions are examined across all parts of the electromagnetic spectrum, and the properties examined include luminosity, density, temperature, and chemical composition. Because astrophysics is a very broad subject, astrophysicists typically apply many disciplines of physics, including mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics, relativity, nuclear and particle physics, and atomic and molecular physics. In practice, modern astronomical research involves a substantial amount of physics. The name of a university's department ("astrophysics" or "astronomy") often has to do more with the department's history than with the contents of the programs. Astrophysics can be studied at the bachelors, masters, and Ph.D. levels in aerospace engineering, physics, or astronomy departments at many universities.

Do you mean atrophy? This is the wasting away of tissue or an organ.