References 355% CONFIDENCEOverall confidence: 55%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]40%
  en.wikipedia.org/wiki/Thirty_Meter_Telescope

  en.wikipedia.org· Posted Sep 11, 2026· Starts Jun 1, 2027· 40% of score

  Date has moved, per the pin description: "…. A 30-metre segmented-mirror telescope stalled for a decade by opposition to building on Mauna Kea,…"

• [2]90%
  Thirty Meter Telescope - Environmental Compliance

  nsf.gov· Added Sep 15, 2026· Starts Dec 31, 2026 ✓· 41% of score

  The National Science Foundation's own page states NSF extended its environmental review of the Thirty Meter Telescope (a required step before any Mauna Kea vs. La Palma site decision) to conclude by 31 December 2026, a concrete near-term deadline closer than the pin's stored June 2027 date.

• [3]80%
  The Thirty Meter Telescope Is Still Alive - For Now

  civilbeat.org· Published Mar 1, 2026· 19% of score

  Honolulu Civil Beat reports the same NSF^[2] and University of Hawaii timeline: environmental review through end of 2026, with Mauna Kea management needing to finalize which observatories continue by January 2027, corroborating the decision-timeline pressure the pin describes.

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