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• Astrophysics
  Galaxies
  Cosmology
  Physics
  Black Holes
  Astronomy
   
  

  Redshift

  In physics and astronomy, redshift is an observed increase in the wavelength of electromagnetic radiation received by a detector compared to that emitted by the source. For visible light, red is the ... > more
• Black Holes
  Astrophysics
  Sports Science
  Sun
  Cosmic Rays
  Solar Flare
   
  

  Black body

  In physics, a black body is an object that absorbs all electromagnetic radiation that falls onto it. No radiation passes through it and none is reflected, yet in classical physics, it can ... > more
• Cosmic Rays
  Black Holes
  Space Telescopes
  NASA
  Space Exploration
  Astronomy
   
  

  Gamma ray burst

  Gamma-ray bursts are the most luminous physical phenomena in the universe known to the field of astronomy. They consist of flashes of gamma rays that last from seconds to hours, the longer ones being ... > more
• Venus
  Solar System
  Sun
  Astronomy
  Solar Flare
  Extrasolar Planets
   
  

  Transit of Venus

  A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and Earth, becoming visible against (and hence obscuring a small portion of) the solar disk. During ... > more
• Moon
  Space Exploration
  Space Missions
  Space Probes
  NASA
  Astronomy
   

  Lunar space elevator

  A lunar space elevator (also called a moonstalk) is a proposed cable running from the surface of the Moon into space. It is similar in concept to the better known Earth space elevator idea (a cable ... > more
• Optics
  Cosmic Rays
  Physics
  Medical Technology
  Black Holes
  Astrophysics
   
  

  Electromagnetic spectrum

  The electromagnetic spectrum is the range of all possible electromagnetic radiation. Above infrared in frequency comes visible light. This is the range in which the sun and stars similar to it emit ... > more
• Dark Matter
  Astrophysics
  Astronomy
  Galaxies
  Solar Flare
  Sun
   
  

  Dark matter

  In astrophysics and cosmology, dark matter is hypothetical matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can ... > more
• Nature of Water
  Physics
  Astrophysics
  Quantum Physics
  Thermodynamics
  Dark Matter
   
  

  Phase (matter)

  A phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e. density, crystal structure, index of refraction, and so ... > more
• Nuclear Energy
  Physics
  Astrophysics
  Weapons Technology
  Energy Technology
  Solar Energy
   
  

  Nuclear fusion

  In physics, nuclear fusion is the process by which multiple nuclei join together to form a heavier nucleus. It is accompanied by the release or absorption of energy depending on the masses of the ... > more
• Sun
  Black Holes
  Moon
  Asteroids, Comets and Meteors
  Solar Flare
  Pluto
   
  

  Precession

  Precession refers to a change in the direction of the axis of a rotating object. In certain contexts, "precession" may refer to the precession that the Earth experiences, the effects of this type of ... > more

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