Neptune Articles

• Optics
  Cosmic Rays
  Physics
  Medical Technology
  Black Holes
  Astrophysics
   
  

  Electromagnetic spectrum

  The electromagnetic spectrum is the range of all possible electromagnetic radiation. Above infrared in frequency comes visible light. This is the range in which the sun and stars similar to it emit ... > 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
• Albert Einstein
  Black Holes
  Physics
  Quantum Physics
  Sports Science
  Asteroids, Comets and Meteors
   
  

  Gravitation

  Gravity is a force of attraction that acts between bodies that have mass. Gravity is the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not ... > more
• Astronomy
  Galaxies
  Cosmic Rays
  Black Holes
  Solar Flare
  Stars
   
  

  Light-year

  A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in a vacuum in one year. While there is no authoritative decision on which year is ... > more
• Moon
  Space Missions
  NASA
  Space Exploration
  Space Probes
  Space Station
   
  

  Neil Armstrong

  Neil Alden Armstrong (born August 5, 1930) is a former American astronaut, test pilot, naval aviator. He is famous as the first human ever to step foot on the ... > more
• NASA
  Space Telescopes
  Space Exploration
  Galaxies
  Astrophysics
  Black Holes
   
  

  Hubble Deep Field

  The Hubble Deep Field (HDF) is an image of a small region of the sky, based on the results of a series of observations by the Hubble Space Telescope. The field is so small that only a few foreground ... > more
• Astronomy
  Solar System
  Extrasolar Planets
  Mars
  Sun
  Nebulae
   
  

  Johannes Kepler

  Johannes Kepler (December 27, 1571 - November 15, 1630), a key figure in the scientific revolution, was a German Lutheran mathematician, astrologer, and astronomer. Kepler lived in an era when there ... > more
• Quantum Physics
  Physics
  Chemistry
  Inorganic Chemistry
  Cosmic Rays
  Graphene
   
  

  Atom

  In chemistry and physics, an atom is the smallest particle of a chemical element that retains its chemical properties. An atom consists of a dense nucleus of positively-charged protons and ... > more
• Northern Lights
  Space Exploration
  Space Missions
  Space Station
  NASA
  Space Probes
   
  

  Ion thruster

  An ion thruster (or ion drive), one of several types of spacecraft propulsion, uses beams of ions - electrically charged atoms or molecules - for propulsion. The precise method for accelerating the ... > more
• Galaxies
  Astrophysics
  Astronomy
  Cosmology
  Stars
  Big Bang
   
  

  Galaxy formation and evolution

  The formation of galaxies is still one of the most active research areas in astrophysics; and, to some extent, this is also true for galaxy evolution. Some ideas, however, are now widely accepted. ... > more

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