{"id":630591,"date":"2026-09-20T15:36:11","date_gmt":"2026-09-20T15:36:11","guid":{"rendered":"https:\/\/www.newsbeep.com\/ie\/630591\/"},"modified":"2026-09-20T15:36:11","modified_gmt":"2026-09-20T15:36:11","slug":"in-2011-nasa-sent-a-solar-sail-the-size-of-a-small-apartment-into-orbit-the-thin-reflective-sheet-flew-without-fuel","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ie\/630591\/","title":{"rendered":"In 2011, NASA sent a solar sail the size of a small apartment into orbit; the thin reflective sheet flew without fuel |"},"content":{"rendered":"

\"InA photo of the experimental solar sail, NanoSail-D. Credits – Wikimedia Commons Spacecraft have historically relied on transporting their own fuel, a hefty and limited resource that restricts how long a mission can manoeuvre once in orbit. For a long time, scientists have been wondering whether there was a more environmentally friendly option that might use the energy already there in space instead of burning through a finite tank. Before NASA ultimately conducted a thorough test in low Earth orbit, the concept of sailing on sunlight itself had existed in theory for decades.A tiny, humble satellite called NanoSail-D2 made that experiment possible, built through a collaboration between NASA’s Marshall Space Flight Center and Ames Research Center. It was a spaceship that, when folded up for launch, was hardly larger than a loaf of bread but carried a solar sail that could unfurl to many times the size of its container. On 20 January 2011, NASA said that engineers had confirmed the sail had successfully deployed, marking NASA’s first successful deployment of a solar sail in low Earth orbit.No engine at all, a sheet of reflective materialUnfurled, the sail expanded to about 100 square feet, roughly the size of a small bedroom, and was made of an ultra-thin, lightweight reflective polymer, according to NASA. NanoSail-D2 had no propulsion mechanism of any kind, unlike a typical satellite. Instead, it relied on the gentle, continuous push of solar radiation, with sunlight photons colliding with its reflecting surface. Its large surface area also caught more drag from the tenuous wisps of atmosphere still clinging to low orbital altitudes \u2014 a separate effect that would matter for the mission’s second act.That combination made the sail usable for something more than just establishing the concept. A satellite with a wide, flat surface is substantially more susceptible to atmospheric drag, which will progressively reduce its velocity and cause it to re-enter long before it would normally disintegrate on its own. Rather than letting them drift for decades, mission planners are studying whether this phenomenon may be used as a cheap, fuel-free way of clearing crowded orbits of ageing satellites and debris once they have come to the end of their functional lives.\"NanoSail-D_in_orbit_(artist_depiction)<\/p>\n

Artist\u2019s concept of NanoSail-D in space. Credits – Wikimedia Commons\u00a0<\/p>\n

Watching a sail float silently aboveThe expedition didn\u2019t quite go to plan at first. NanoSail D2 was supposed to have been deployed from its host satellite, FASTSAT, in December 2010, but the release mechanism didn\u2019t fire, leaving the tiny spacecraft in place for weeks. It self-ejected in mid-January 2011 and successfully deployed its sail days later, according to NASA. NASA Science<\/a> says the sail was visible from the ground as a bright, fast-moving point of light, and NASA even held a public photography competition urging skywatchers to snap photographs of it passing by.Instead of lasting 70 to 120 days as engineers originally projected, the sail remained in orbit for a full 240 days, performing well beyond expectations before burning up during reentry in September 2011. Independent technical reviews later published by eoPortal<\/a> highlighted the prolonged lifespan gave researchers substantially more orbital data than expected, helping revise projections for how comparable sails would perform on future missions.A thin sheet with significant implicationsNanoSail D2’s trip was modest by the standards of most NASA missions, costing little compared with a typical satellite programme, and involved a spacecraft small enough to hold in two hands before launch. But it was a working premise that has guided a number of solar sail projects since, including missions designed particularly to go further with nothing but sunlight for propulsion. A sheet of reflective material, little thicker than kitchen cling film, showed that leaving the fuel tank behind was theoretically viable and could be built and flown on a modest budget.<\/p>\n","protected":false},"excerpt":{"rendered":"A photo of the experimental solar sail, NanoSail-D. Credits – Wikimedia Commons Spacecraft have historically relied on transporting…\n","protected":false},"author":2,"featured_media":630592,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[267695,61,60,267693,267694,267696,82,89117,247],"class_list":["post-630591","post","type-post","status-publish","format-standard","has-post-thumbnail","category-space","tag-fuel-free-propulsion","tag-ie","tag-ireland","tag-nanosail-d2","tag-nasa-space-missions","tag-sailing-on-sunlight","tag-science","tag-solar-sail","tag-space"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/630591","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/comments?post=630591"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/630591\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media\/630592"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media?parent=630591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/categories?post=630591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/tags?post=630591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}