International Space Station Articles

• 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
• Saturn
  Solar System
  Astronomy
  Space Exploration
  Space Probes
  Moon
   
  

  Saturn

  Saturn is the sixth planet from the Sun. It is a gas giant, the second-largest planet in the solar system after Jupiter. Saturn has a prominent system of rings, consisting of mostly ice particles ... > more
• Mars
  Solar System
  NASA
  Space Missions
  Space Exploration
  Astronomy
   
  

  Phobos (moon)

  Phobos is the larger and innermost of Mars' two moons, and is named after Phobos, son of Ares (Mars) from Greek Mythology. Phobos orbits closer to a major planet than any other moon in the solar ... > more
• Cosmology
  Big Bang
  Astrophysics
  Black Holes
  Space Telescopes
  Astronomy
   
  

  Multiverse

  A multiverse (or meta-universe) is the hypothetical set of multiple possible universes, including our universe, which comprise the absolute whole of physical ... > more
• 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
• 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
• Asteroids, Comets and Meteors
  Astronomy
  Stars
  Space Exploration
  Space Telescopes
  Sun
   
  

  Comet Hale-Bopp

  Comet Hale-Bopp was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades. It was visible to the naked eye for a record 18 months, twice as long ... > 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
• Neptune
  Solar System
  Jupiter
  Astronomy
  Pluto
  Extrasolar Planets
   
  

  Neptune

  Neptune is the eighth and outermost planet in our solar system. It is the fourth-largest planet by diameter and the third-largest by mass; Neptune is 17 times the mass of Earth and is slightly more ... > more
• Albert Einstein
  Black Holes
  Physics
  Quantum Physics
  Cosmology
  Sports Science
   
  

  General relativity

  General relativity (GR) is the geometrical theory of gravitation published by Albert Einstein in 1915. It unifies special relativity and Sir Isaac Newton's law of universal gravitation with the ... > more

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