Lunar Articles

• Space Probes
  Space Exploration
  Space Station
  Vehicles
  Aviation
  Sports Science
   
  

  Multistage rocket

  A multistage (or multi-stage) rocket is, like any rocket, propelled by the recoil pressure of the burning gases it emits as it burns fuel. What characterizes it as "multi-stage" is that it ... > more
• Extrasolar Planets
  Satellites
  Kuiper Belt
  Pluto
  Asteroids, Comets and Meteors
  Galaxies
   

  Equatorial bulge

  An equatorial bulge is a planetological term which describes a bulge which a planet may have around its equator, distorting it into an oblate spheroid. Because of a planet's equatorial bulge, its ... > more
• NASA
  Space Telescopes
  Astronomy
  Space Exploration
  Satellites
  Galaxies
   
  

  Spitzer Space Telescope

  Spitzer Space Telescope (formerly the Space Infrared Telescope Facility [SIRTF]) is an infrared space observatory, the fourth and final of NASA's Great Observatories. The first images taken by SST ... > more
• Northern Lights
  Solar Flare
  Sun
  Astronomy
  Jupiter
  Black Holes
   
  

  Aurora (astronomy)

  The aurora is a glow observed in the night sky, usually in the polar zone. It is also known as "northern lights" or "aurora borealis," which is Latin for "northern dawn" since in Europe especially, ... > more
• Black Holes
  Cosmic Rays
  Stars
  Astronomy
  Astrophysics
  Sun
   
  

  Gravitational wave

  In physics, in terms of a metric theory of gravitation, a gravitational wave is a fluctuation in the curvature of space-time which propagates as a wave, traveling outward from a moving object or ... > more
• Stars
  Astronomy
  Extrasolar Planets
  Galaxies
  NASA
  Black Holes
   
  

  Sirius

  Sirius is the brightest star in the nighttime sky. Sirius can be seen from every inhabited region of the Earth's surface. There are a few unsolved mysteries regarding ... > 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
• 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
• Geomagnetic Storms
  Sun
  Solar Flare
  Renewable Energy
  Energy and the Environment
  Wind Energy
   
  

  Solar wind

  A solar wind is a stream of charged particles (i.e., a plasma) which are ejected from the upper atmosphere of a star. When originating from stars other than the Earth's Sun, it is sometimes called a ... > more
• Solar Flare
  Sun
  Astronomy
  Northern Lights
  Astrophysics
  Cosmic Rays
   
  

  Corona

  In astronomy, a corona is the luminous plasma "atmosphere" of the Sun or other celestial body, extending millions of kilometres into space, most easily seen during a total solar eclipse, but also ... > more

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