Ultra - diffuse galaxy - as big as Milky Way but very dimly lit

Q.  What is an Ultra-diffuse galaxy?
- Published on 02 Aug 16

a. Galaxy larger and brighter than Milky Way
b. Galaxy in decline and collapse
c. Galaxy smaller and brighter than Milky Way
d. Galaxy as large as Milky Way but very less luminosity

ANSWER: Galaxy as large as Milky Way but very less luminosity
 
  • An ultra-diffuse galaxy (UDG) is an extremely-low-density galaxy. Such a galaxy may have the same size as the Milky Way but a visible star count of only 1%. Their lack of luminosity is due to the lack of star-forming gas in the galaxy.
  • Ultra diffuse galaxies are large like the Milky Way — which is much bigger than most — but they glow as dimly as mere dwarf galaxies. They came to attention only last year.

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