Astronomy Articles

• Cosmic Rays
  Black Holes
  Space Telescopes
  NASA
  Space Exploration
  Astronomy
   
  

  Gamma ray burst

  Gamma-ray bursts are the most luminous physical phenomena in the universe known to the field of astronomy. They consist of flashes of gamma rays that last from seconds to hours, the longer ones being ... > 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
• Jupiter
  Solar System
  Astronomy
  Space Exploration
  Space Probes
  Pluto
   
  

  Jupiter

  Jupiter is the fifth planet from the Sun and by far the largest within the solar system. Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon and Venus); however at ... > more
• Space Missions
  Space Exploration
  NASA
  Uranus
  Space Probes
  Jupiter
   
  

  Voyager program

  The Voyager program consisted of a pair of unmanned scientific probes, Voyager 1 and Voyager 2, launched in 1977. They were sent to study Jupiter and Saturn, using an advantageous planetary alignment ... > more
• Astrophysics
  Nebulae
  Galaxies
  Cosmic Rays
  Astronomy
  Stars
   
  

  Interstellar medium

  The interstellar medium (or ISM) is the name astronomers give to the tenuous gas and dust that pervade interstellar space. Whilst the ISM refers to the matter (interstellar matter, also abbreviated ... > more
• Astronomy
  Astrophysics
  Extrasolar Planets
  Galaxies
  Solar System
  Stars
   
  

  Astronomy

  Astronomy is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background ... > 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
• Space Station
  Space Probes
  Space Exploration
  NASA
  Astronomy
  Space Telescopes
   
  

  Outer space

  Outer space, also simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and ... > more
• Galaxies
  Astronomy
  Astrophysics
  Stars
  NASA
  Space Telescopes
   
  

  Andromeda Galaxy

  TThe Andromeda Galaxy (also known as Messier 31, M31, or NGC 224; older texts often called it the Andromeda Nebula) is a spiral galaxy approximately 2.5 million light-years away in the constellation ... > more
• Solar System
  Extrasolar Planets
  Kuiper Belt
  Pluto
  Astronomy
  Eris (Xena)
   
  

  Planet

  The International Astronomical Union defines "planet" as a celestial body that, within the Solar System that is in orbit around the Sun; has sufficient mass for its self-gravity to overcome rigid ... > more

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