The following is a list of the largest optical reflecting telescopes sorted by mirror diameter. Note that two of the first three are not yet operational. This list does not currently include telescopes that are still in the conceptual/proposed stage, such as the Overwhelmingly Large Telescope or the European Extremely Large Telescope; the design stage, such as the Thirty Meter Telescope; or ones still in the early stages of manufacturing such as the Giant Magellan Telescope.
The Taking Children Seriously List is a forum for the discussion of TCS parenting/education theory and practice, and for the support of parents trying to improve their lives and the lives of their children in part by making their interactions with their children consentual (that is, consensual in the sense of wholehearted consent, not ‘consensus’).