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• Sun
  Solar Flare
  Northern Lights
  Astronomy
  Solar System
  Extrasolar Planets
   
  

  Sunspot

  A sunspot is a region on the Sun's surface (photosphere) that is marked by a lower temperature than its surroundings and intense magnetic activity, which inhibits convection, forming areas of low ... > more
• Space Station
  Space Exploration
  NASA
  Space Probes
  Astronomy
  Space Missions
   
  

  Space elevator

  A space elevator is a theoretical structure designed to transport material from a planet's surface into space. Many different types of space elevators have been proposed. They all share the goal of ... > more
• Cosmology
  Big Bang
  Astrophysics
  Galaxies
  Astronomy
  Satellites
   
  

  Shape of the Universe

  The shape of the Universe is a subject of investigation within physical cosmology. Cosmologists and astronomers describe the geometry of the Universe which includes both local geometry and global ... > more
• Space Station
  NASA
  Space Exploration
  Space Probes
  Space Missions
  Astronomy
   
  

  Space Shuttle program

  NASA's Space Shuttle, officially called Space Transportation System (STS), is the United States government's only manned launch vehicle currently in service. It is the first winged manned spacecraft ... > more
• Atmosphere
  Geomagnetic Storms
  Northern Lights
  Solar Flare
  Sun
  Ozone Holes
   
  

  Ionosphere

  The ionosphere is the part of the atmosphere that is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical ... > more
• Astronomy
  Cosmology
  Sun
  Extrasolar Planets
  Solar System
  Satellites
   
  

  Nicolaus Copernicus

  Nicolaus Copernicus (February 19, 1473 - May 24, 1543) was the astronomer who formulated the first modern heliocentric theory of the solar system. His epochal text, De revolutionibus orbium ... > more
• Black Holes
  Cosmology
  Computers and Internet
  Mars
  Mathematics
  Astrophysics
   
  

  Albert Einstein

  Albert Einstein (March 14, 1879 to April 18, 1955) was a German-born theoretical physicist widely regarded as the greatest scientist of the 20th century. He was the author of the general theory of ... > more
• Quantum Physics
  Physics
  Quantum Computing
  Black Holes
  Spintronics
  Sports Science
   
  

  Schrodinger's cat

  Schrödinger's cat is a seemingly paradoxical thought experiment devised by Erwin Schrödinger that attempts to illustrate the incompleteness of an early interpretation of quantum mechanics ... > more
• Space Telescopes
  Space Exploration
  NASA
  Astronomy
  Satellites
  ESA
   
  

  European Southern Observatory

  The European Southern Observatory (ESO, also more formally the European Organisation for Astronomical Research in the Southern Hemisphere) is an intergovernmental research organisation for astronomy, ... > 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

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