Nebula Articles

• 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
• Mars
  Extrasolar Planets
  Solar System
  NASA
  Space Missions
  Space Exploration
   

  Astrobiology

  Astrobiology is the study of life in space, combining aspects of astronomy, biology and geology. It is focused primarily on the study of the origin, distribution and evolution of ... > more
• Stars
  Extrasolar Planets
  Jupiter
  Sun
  Astronomy
  Solar Flare
   
  

  Red giant

  A red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giant stars. As Earth's sun is of one solar mass, it is ... > more
• Galaxies
  Stars
  Eris (Xena)
  Astrophysics
  Kuiper Belt
  Astronomy
   
  

  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
• Solar Flare
  Sun
  Northern Lights
  Asteroids, Comets and Meteors
  Black Holes
  Satellites
   
  

  Magnetosphere

  A magnetosphere is the region around an astronomical object in which phenomena are dominated or organized by its magnetic field. Earth is surrounded by a magnetosphere, as are the magnetized planets ... > more
• Venus
  Solar System
  NASA
  Space Missions
  Space Exploration
  Mars
   
  

  Venus

  Venus is the second-closest planet to the Sun, orbiting it every 224.7 Earth days. It is the brightest object in the night sky, except for the Moon, reaching an apparent magnitude of -4.6. Venus ... > more
• Galaxies
  Astrophysics
  Astronomy
  Space Telescopes
  NASA
  Space Exploration
   
  

  Barred spiral galaxy

  A barred spiral galaxy is a spiral galaxy with a band of bright stars emerging from the center and running across the middle of the ... > more
• Cosmic Rays
  Black Holes
  Space Telescopes
  NASA
  Space Exploration
  Galaxies
   
  

  Gamma ray burst

  Gamma-ray bursts are the most luminous physical phenomena in the universe known to the field of astronomy. They consist of flashes of gamma rays that last from seconds to hours, the longer ones being ... > more
• Space Probes
  Space Exploration
  Space Station
  NASA
  Space Missions
  Solar Flare
   
  

  Spacecraft propulsion

  Spacecraft propulsion is used to change the velocity of spacecraft and artificial satellites, or in short, to provide delta-v. There are many different methods. Each method has drawbacks and ... > more
• Asteroids, Comets and Meteors
  Solar System
  Pluto
  Kuiper Belt
  Jupiter
  Eris (Xena)
   
  

  Asteroid belt

  The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. Despite popular imagery, the ... > more
• Galaxies
  Astronomy
  Stars
  Astrophysics
  Solar Flare
  Black Holes
   
  

  Milky Way

  The Milky Way is a barred spiral galaxy which forms part of the Local Group. Although the Milky Way is but one of billions of galaxies in the universe, the Galaxy has special significance to humanity ... > more

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