Mercury Articles

• 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
• Extrasolar Planets
  Kuiper Belt
  Stars
  Astronomy
  Pluto
  Eris (Xena)
   
  

  Extrasolar planet

  An extrasolar planet, or exoplanet, is a planet beyond the Solar System. As of 11 November 2006, 209 extrasolar planets have been discovered. Known exoplanets are members of planetary systems that ... > more
• Sun
  Solar Flare
  Asteroids, Comets and Meteors
  Black Holes
  Satellites
  Space Exploration
   
  

  Earth's magnetic field

  Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with one pole near the geographic north pole and the other near the geographic south pole. The locations of ... > more
• Space Probes
  Space Exploration
  Space Station
  Astronomy
  Astrophysics
  Space Telescopes
   

  Hybrid rocket

  A hybrid rocket propulsion system comprises propellants of two different states of matter, the most common configuration being a rocket engine composed of a solid propellant lining a combustion ... > more
• Astrophysics
  Dark Matter
  Cosmology
  Astronomy
  Big Bang
  Black Holes
   
  

  Dark energy

  In physical cosmology, dark energy is a hypothetical form of energy that permeates all of space and tends to increase the rate of expansion of the universe. Assuming the existence of dark energy is ... > more
• 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
• 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
• 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
• Astrophysics
  Cosmology
  Big Bang
  Dark Matter
  Astronomy
  Black Holes
   
  

  Big Bang

  The Big Bang is the cosmological model of the universe whose primary assertion is that the universe has expanded into its current state from a primordial condition of enormous density and ... > more
• Black Holes
  Astronomy
  Astrophysics
  Galaxies
  Stars
  Solar Flare
   
  

  Black hole

  A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). The ... > more

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