Space & Time Articles

• Space Telescopes
  Space Exploration
  Astronomy
  NASA
  Satellites
  Astrophysics
   
  

  Radio telescope

  A radio telescope is a form of radio receiver used in astronomy. In contrast to an "ordinary" telescope, which receives visible light, a radio telescope "sees" radio waves emitted by radio sources, ... > 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
  Galaxies
  Cosmology
  Physics
  Black Holes
  Astronomy
   
  

  Redshift

  In physics and astronomy, redshift is an observed increase in the wavelength of electromagnetic radiation received by a detector compared to that emitted by the source. For visible light, red is the ... > 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
• Astrophysics
  Cosmology
  Stars
  Black Holes
  Big Bang
  Cosmic Rays
   

  Nucleosynthesis

  Nucleosynthesis is the process of creating new atomic nuclei from preexisting nucleons (protons and neutrons). The primordial preexisting nucleons were formed from the quark-gluon plasma of the Big ... > more
• Galaxies
  Astrophysics
  Cosmology
  Astronomy
  Big Bang
  Space Telescopes
   
  

  Large-scale structure of the cosmos

  In physical cosmology, the term large-scale structure refers to the characterization of observable distributions of matter and light on the largest scales (typically on the order of billions of ... > more
• Stars
  Galaxies
  Extrasolar Planets
  Sun
  Astronomy
  Solar Flare
   
  

  Blue supergiant

  Blue supergiants are supergiant stars (class I) of spectral type O. They are extremely hot and bright, with surface temperatures of between 20,000 - 50,000 degrees Celsius. The best known example is ... > more
• Cosmology
  Astrophysics
  Physics
  Quantum Physics
  Big Bang
  Albert Einstein
   
  

  Physical cosmology

  Physical cosmology, as a branch of astrophysics, is the study of the large-scale structure of the universe and is concerned with fundamental questions about its formation and evolution. Cosmology ... > 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
• 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
• 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

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