Nebula Articles

• Solar Flare
  Sun
  Northern Lights
  Solar System
  Astronomy
  Cosmic Rays
   
  

  Solar flare

  A solar flare is a violent explosion in the Sun's atmosphere with an energy equivalent to tens of millions of hydrogen bombs. Solar flares take place in the solar corona and chromosphere, heating ... > more
• Albert Einstein
  Black Holes
  Physics
  Quantum Physics
  Sports Science
  Asteroids, Comets and Meteors
   
  

  Gravitation

  Gravity is a force of attraction that acts between bodies that have mass. Gravity is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not ... > more
• Northern Lights
  Space Exploration
  Space Missions
  Space Station
  NASA
  Space Probes
   
  

  Ion thruster

  An ion thruster (or ion drive), one of several types of spacecraft propulsion, uses beams of ions - electrically charged atoms or molecules - for propulsion. The precise method for accelerating the ... > more
• 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
• Space Telescopes
  NASA
  Space Exploration
  Cosmic Rays
  Black Holes
  Astronomy
   
  

  Compton Gamma Ray Observatory

  The Compton Gamma Ray Observatory (CGRO) was the second of the NASA "Great Observatories" to be launched to space, following the Hubble Space Telescope. The observatory was launched on the Space ... > 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
• 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
• Astrophysics
  Optics
  Physics
  Chemistry
  Sports Science
  Graphene
   
  

  Spectroscopy

  Spectroscopy is the study of spectra, that is, the dependence of physical quantities on frequency. Spectroscopy is often used in physical and analytical chemistry for the identification of ... > more
• Space Telescopes
  Space Exploration
  NASA
  Space Station
  Astronomy
  Satellites
   
  

  Space observatory

  A space observatory is any instrument in outer space which is used for observation of distant planets, galaxies, and other outer space objects. A large number of observatories have been launched into ... > more
• Cosmology
  Cosmic Rays
  Astrophysics
  Big Bang
  Astronomy
  Black Holes
   
  

  Cosmic microwave background radiation

  In cosmology, the cosmic microwave background radiation is a form of electromagnetic radiation discovered in 1965. It has a thermal black-body spectrum which peaks in the microwave range. Most ... > more

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