Nebula Articles

• Space Missions
  NASA
  Mars
  Space Exploration
  Solar System
  Space Probes
   
  

  Phoenix (spacecraft)

  The Phoenix is a planned multi-agency Mars lander, headed by the University of Arizona's Lunar and Planetary Laboratory, under the direction of NASA, scheduled to launch on August 3, 2007. It is a ... > more
• Mars
  Solar System
  Astronomy
  Asteroids, Comets and Meteors
  Space Exploration
  Extrasolar Planets
   
  

  Extraterrestrial life

  Extraterrestrial life is life that may exist and originate outside the planet Earth, the only place in the universe currently known by humans to support life. Its existence is currently purely ... > more
• Optics
  Medical Technology
  Sports Science
  Sports Medicine
  Healthy Aging
  Attention Deficit Disorder
   
  

  Doppler effect

  The Doppler effect, named after Christian Andreas Doppler, is the apparent change in frequency or wavelength of a wave that is perceived by an observer moving relative to the source of the waves. The ... > more
• Black Holes
  Astronomy
  Astrophysics
  Galaxies
  Stars
  Solar Flare
   
  

  Black hole

  A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). The ... > more
• Near-Earth Object Impacts
  Asteroids, Comets and Meteors
  Geology
  Saturn
  Earth Science
  Moon
   
  

  Impact crater

  An impact crater is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the ... > more
• Solar System
  Uranus
  Moon
  Pluto
  Jupiter
  Astronomy
   
  

  Uranus' natural satellites

  Uranus has 27 known moons. The first two moons (Titania and Oberon) were discovered by William Herschel on March 13, 1787. Two more moons (Ariel and Umbriel) were discovered by William Lassell in ... > more
• NASA
  Space Exploration
  Space Missions
  Astronomy
  Cosmology
  Astrophysics
   
  

  Carl Sagan

  Dr Carl Edward Sagan (November 9, 1934 - December 20, 1996) was an American astronomer, astrobiologist and highly successful science popularizer. He pioneered exobiology and promoted the Search for ... > more
• Galaxies
  Astrophysics
  Cosmology
  Astronomy
  Big Bang
  Space Telescopes
   
  

  Large-scale structure of the cosmos

  In physical cosmology, the term large-scale structure refers to the characterization of observable distributions of matter and light on the largest scales (typically on the order of billions of ... > more
• Pluto
  Kuiper Belt
  Solar System
  Moon
  Jupiter
  Satellites
   
  

  Charon (moon)

  Charon, discovered in 1978, is, depending on the definition employed, either the largest moon of Pluto or one member of a double dwarf planet with Pluto being the other member. With the discovery in ... > more
• Mars
  NASA
  Space Missions
  Solar System
  Space Exploration
  Astronomy
   
  

  Mars

  Mars is the fourth planet from the Sun in our solar system. It is named after Mars, the Roman god of war. Mars has also earned the nickname "The Red Planet" due to the reddish appearance it has when ... > more

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