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Dark Energy Spectroscopic Instrument (DESI)

Dark Energy Spectroscopic Instrument (DESI):

DESI’s groundbreaking project harnesses 5,000 robots to peer 11 billion years into the past, revealing unprecedented insights into our expanding universe.

  • It found the most precise measurement of the universe expansion rate at a rate of 68.5 (±0.6) kilometres per second per megaparsec (a million parsec; 1 parsec equals 3.2616 light years).
  • DESI made a huge 3D map to study dark energy’s impact over 11 billion years.
  • In the Lambda CDM model, matter and dark energy affect the universe’s expansion differently: matter slows it, while dark energy speeds it up.
  • Both dark energy and dark matter dominate the universe, comprising about 95% of it.


  • DESI is a project aimed at mapping the universe to study dark energy’s effects over billions of years.
  • It is the product of an international collaboration that brings together researchers from more than 70 institutions (including from India).
  • It is a ground-based dark energy experiment, located on the Mayall 4-meter telescope at Kitt Peak National Observatory (USA)