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Space telescopes and observatories: starting with H

Name a space telescope that starts with H. Hopdown accepts 18 answers here. Common answers keep your bunny near the surface; rare ones dig deeper. A telescope or astronomical observatory spacecraft that operates or operated in space, including planned flagship missions. Canonical name starts with H.

Part of Space telescopes and observatories.

Answers

• Hubble Space TelescopeExtremely common
• Herschel Space ObservatoryCommon
• HipparcosUncommon
• HitomiUncommon
• HEAO-1Rare
• HEAO-3Rare
• HinodeRare
• HakuchoRare
• HinotoriRare
• HETE-2Rare
• Habitable Worlds ObservatoryRare
• HabExRare
• HETEVery rare
• HalcaVery rare
• HisakiVery rare
• Habitable Exoplanet ObservatoryVery rare
• HXMTDeep cut
• Hopkins Ultraviolet TelescopeDeep cut