Asteroid, Comet, Meteor Articles

• 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
• 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
• Space Telescopes
  Space Exploration
  NASA
  Satellites
  Astronomy
  Black Holes
   

  Active optics

  Active optics is a relatively new technology for reflecting telescopes developed in the 1980s, which has more recently enabled the construction of a generation of telescopes with 8 metre primary ... > more
• Stars
  Eris (Xena)
  Galaxies
  Astronomy
  Astrophysics
  Extrasolar Planets
   
  

  Brown dwarf

  Brown dwarfs were originally called black dwarfs, a classification for dark substellar objects floating freely in space which were too low in mass to sustain stable hydrogen ... > more
• Space Telescopes
  Space Exploration
  NASA
  Satellites
  Astronomy
  Cosmic Rays
   
  

  Telescope

  A telescope is an instrument designed for the observation of remote objects. The term usually refers to optical telescopes, but there are telescopes for most of the spectrum of electromagnetic ... > more
• Satellites
  Moon
  Pluto
  Neptune
  Sun
  NASA
   

  Geosynchronous orbit

  A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis of 42,164 km (26,200 miles). In the special case ... > 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
• Nebulae
  Stars
  Space Telescopes
  Astrophysics
  Galaxies
  NASA
   
  

  Orion Nebula

  The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a glowing emission nebula with a greenish hue and is situated below Orion's Belt. It is one of the brightest nebulae visible to the ... > more
• Extrasolar Planets
  Solar System
  Jupiter
  Astronomy
  Kuiper Belt
  Stars
   
  

  Gas giant

  A gas giant is a large planet that is not primarily composed of rock or other solid matter. Gas giants may have a rocky or metallic core—in fact, such a core is thought to be required for a gas ... > more
• NASA
  Space Exploration
  Space Missions
  Space Station
  Astronomy
  Space Probes
   
  

  NASA

  The National Aeronautics and Space Administration (NASA), which was established in 1958, is the agency responsible for the public space program of the United States of America. NASA's vision is "to ... > more

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