Top 3 Most Powerful Space Telescopes by Mirror Size

A ranking of the largest optical mirrors in space, determining the light-gathering capability of humanity's most advanced observatories.

The top 3

  1. James Webb Space Telescope: The Current Champion: With a 6.5-meter primary mirror, it remains the largest and most sensitive space telescope currently in operation. James Webb Space Telescope
  2. Nancy Grace Roman Space Telescope: The Wide-Angle Master: Boasting a 2.4-meter primary mirror, it matches the size of Hubble while providing a field of view 100 times larger. Nancy Grace Roman Space Telescope
  3. Hubble Space Telescope: The Iconic Pioneer: Operating with a 2.4-meter mirror since 1990, it remains one of the most productive scientific instruments in history. Hubble Space Telescope

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