Astrophysics Articles

• Cosmic Rays
  Black Holes
  Detectors
  Space Telescopes
  Medical Technology
  Medical Imaging
   
  

  X-ray

  X-rays are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.1 nanometers, corresponding to frequencies in the range 30 to 3000 PHz. X-rays are primarily used for ... > more
• Asteroids, Comets and Meteors
  Jupiter
  Astronomy
  Space Exploration
  Solar System
  NASA
   
  

  Comet Shoemaker-Levy 9

  Comet Shoemaker-Levy 9 (SL9, formally designated D/1993 F2) was a comet which collided with Jupiter in 1994, providing the first direct observation of the collision of two solar system ... > more
• Solar Flare
  Cosmic Rays
  Sun
  Asteroids, Comets and Meteors
  NASA
  Satellites
   
  

  Van Allen radiation belt

  The Van Allen radiation belt is a torus of energetic charged particles (i.e. a plasma) around Earth, trapped by Earth's magnetic field. When the belts "overload", particles strike the upper ... > more
• Black Holes
  Astrophysics
  Astronomy
  Galaxies
  Cosmology
  Dark Matter
   
  

  Holographic principle

  The holographic principle is a property of quantum gravity theories which resolves the black hole information paradox within string theory. First proposed by Gerard 't Hooft, it was given a precise ... > more
• Space Probes
  Space Exploration
  Space Station
  Astronomy
  NASA
  Space Missions
   
  

  Spacecraft propulsion

  Spacecraft propulsion is used to change the velocity of spacecraft and artificial satellites, or in short, to provide delta-v. There are many different methods. Each method has drawbacks and ... > more
• Solar System
  Astronomy
  Pluto
  Sun
  Asteroids, Comets and Meteors
  Solar Flare
   
  

  Solar System

  The Solar System consists of the Sun and the other celestial objects gravitationally bound to it: the eight planets, their 165 known moons, three dwarf planets (Ceres, Pluto, and Eris and their four ... > 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
  Aviation
  Vehicles
  Satellites
  Physics
  NASA
   
  

  Infrared

  Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of microwave radiation. The name means "below red", red being the color ... > more
• Chemistry
  Nature of Water
  Inorganic Chemistry
  Sports Science
  Thermodynamics
  Graphene
   
  

  Sodium

  Sodium is the chemical element in the periodic table that has the symbol Na and atomic number 11. Sodium is a soft, waxy, silvery reactive metal belonging to the alkali metals that is abundant in ... > more
• Saturn
  Solar System
  Pluto
  Astronomy
  Moon
  Space Exploration
   
  

  Titan (moon)

  Titan, or Saturn VI, is the largest moon of Saturn and the second largest moon in the solar system, after Jupiter's moon Ganymede. It is roughly 50% larger than Earth's moon by diameter, and is ... > more

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