Nebula Articles

• 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
• 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
• 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
• 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
• Jupiter
  Solar System
  Astronomy
  Space Exploration
  Space Probes
  Pluto
   
  

  Jupiter

  Jupiter is the fifth planet from the Sun and by far the largest within the solar system. Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon and Venus); however at ... > more
• Quantum Physics
  Physics
  Cosmic Rays
  Detectors
  Astrophysics
  Black Holes
   
  

  Neutrino

  The neutrino is an elementary particle. It has half-integer spin and is therefore a fermion. All neutrinos observed to date have left-handed chirality. Although they had been considered massless for ... > 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
• 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
• Space Station
  Space Probes
  Space Exploration
  NASA
  Astronomy
  Space Telescopes
   
  

  Outer space

  Outer space, also simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and ... > more
• Dark Matter
  Astrophysics
  Astronomy
  Galaxies
  Solar Flare
  Sun
   
  

  Dark matter

  In astrophysics and cosmology, dark matter is hypothetical matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can ... > more

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