NASA Articles

• Earth Science
  Geology
  Geomagnetic Storms
  Near-Earth Object Impacts
  Stars
  Asteroids, Comets and Meteors
   
  

  Precession of the equinoxes

  The precession of the equinoxes refers to the precession of Earth's axis of rotation with respect to inertial space. The precession of the equinoxes is caused by the differential gravitational forces ... > more
• Black Holes
  Cosmology
  Space Station
  NASA
  Astronomy
  Space Probes
   

  Presentism (philosophy of time)

  In the philosophy of time, presentism is the belief that neither the future nor the past exists. The opposite of presentism is 'eternalism', which is a belief in things that are past and things that ... > more
• Stars
  Extrasolar Planets
  Astronomy
  Black Holes
  Galaxies
  NASA
   
  

  Star Trek: The Original Series

  Star Trek is a science fiction television series created by Gene Roddenberry which aired from September 8, 1966 through June 3, 1969, with a total of 79 episodes aired and 80 episodes produced. ... > more
• Galaxies
  Stars
  Eris (Xena)
  Astronomy
  Astrophysics
  Kuiper Belt
   
  

  Local Group

  The Local Group (also called M31 group or the Andromeda group) is the group of galaxies that includes our galaxy, the Milky Way. The group comprises over 30 galaxies, with its gravitational center ... > more
• Black Holes
  Astronomy
  Solar Flare
  Space Station
  Astrophysics
  Space Exploration
   
  

  Time

  Trying to understand time has long been a prime occupation for philosophers, scientists and artists. There are widely divergent views about its meaning, hence it is difficult to provide an ... > more
• Spintronics
  Physics
  Electricity
  Quantum Physics
  Cosmic Rays
  Materials Science
   
  

  Electron

  The Electron is a fundamental subatomic particle that carries an electric charge. It is a spin-half lepton that participates in electromagnetic interactions, and its mass is less than one thousandth ... > more
• Black Holes
  Space Station
  Astronomy
  Space Probes
  NASA
  Space Telescopes
   
  

  Spacetime

  In physics, spacetime is a model that combines 3-D space and 1-D time into a single construct called the space-time continuum (the 4th ... > more
• Stars
  Black Holes
  Nebulae
  Astrophysics
  Galaxies
  Extrasolar Planets
   
  

  Stellar evolution

  In astronomy, stellar evolution is the sequence of changes that a star undergoes during its lifetime; the hundreds of thousands, millions or billions of years during which it emits light and heat. ... > more
• Mathematics
  Computer Modeling
  Mathematical Modeling
  Computational Biology
  Space Station
  NASA
   
  

  Hyperbolic geometry

  In mathematics, hyperbolic geometry is a non-Euclidean geometry, meaning that the parallel postulate of Euclidean geometry is rejected. The parallel postulate in Euclidean geometry states, for two ... > more
• Galaxies
  Stars
  Astronomy
  Nebulae
  Astrophysics
  Space Telescopes
   
  

  Magellanic Clouds

  The two Magellanic Clouds are irregular dwarf galaxies orbiting our Milky Way galaxy, and thus are members of our Local Group of galaxies.The Large Magellanic Cloud (LMC) and its neighbour and ... > more

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