Space & Time Articles

• 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
• Cosmic Rays
  Black Holes
  Space Telescopes
  NASA
  Space Exploration
  Astronomy
   
  

  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
• Cosmology
  Big Bang
  Astrophysics
  Galaxies
  Astronomy
  Satellites
   
  

  Shape of the Universe

  The shape of the Universe is a subject of investigation within physical cosmology. Cosmologists and astronomers describe the geometry of the Universe which includes both local geometry and global ... > 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
• 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
• Stars
  Galaxies
  Astronomy
  Extrasolar Planets
  Sun
  Cosmic Rays
   
  

  Alpha Centauri

  Alpha Centauri (α Cen / α Centauri) is the brightest star system (a triple star system) in the southern constellation of Centaurus, and contains the fourth brightest star in the night ... > 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
• Stars
  Astrophysics
  Astronomy
  Sun
  Extrasolar Planets
  Sports Science
   
  

  Luminosity

  In general physics, luminosity (more properly called luminance) is the density of luminous intensity in a given ... > more
• Space Telescopes
  NASA
  Space Exploration
  Black Holes
  Astronomy
  Cosmic Rays
   
  

  Chandra X-ray Observatory

  Chandra X-ray Observatory is a satellite launched on STS-93 by NASA on July 23, 1999. It was named in honor of Indian-American physicist Subrahmanyan Chandrasekhar who is known for determining the ... > 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

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