{"product_id":"forever-stamps-2021-sun-science-educational-nature-series-first-class-postage","title":"Sun Science 2021 Forever Stamps — Solar Dynamics Observatory Images, Panes of 20","description":"\u003ch2\u003eIssue facts\u003c\/h2\u003e\n\u003cp\u003eFirst Day of Issue: June 18, 2021\u003cbr\u003eFirst Day City: Greenbelt, Maryland\u003cbr\u003ePrinted by: Banknote Corporation of America\u003cbr\u003ePrinting Method: Flexographic, Foil Stamping\u003cbr\u003eFormat: Panes of 20\u003c\/p\u003e\n\u003ch2\u003eThe set\u003c\/h2\u003e\n\u003cp\u003eTen designs, each showing a different solar feature or event, built from colorized imagery captured by NASA's Solar Dynamics Observatory. This one is a coronal hole seen in extreme ultraviolet light. The colors are not decorative — each corresponds to a wavelength, and each wavelength reveals a different layer or process. The ceremony was held at the Greenbelt Main Post Office, since NASA's Goddard Space Flight Center was closed for the Juneteenth federal holiday.\u003c\/p\u003e\n\u003ch2\u003eWhat the Sun is doing\u003c\/h2\u003e\n\u003cp\u003eOur star is a G-type main-sequence star, with surface temperatures between roughly 5,300 and 6,000 Kelvin — about 9,000 to 10,000 degrees Fahrenheit.\u003c\/p\u003e\n\u003cp\u003eStars of this class generate heat and light through nuclear fusion in the core. The Sun converts 600 million tons of hydrogen into helium every second, turning four million tons of matter into pure energy in the process.\u003c\/p\u003e\n\u003cp\u003eReactors on Earth run on fission, not fusion. Building a fusion reactor that produces more energy than it consumes remains extraordinarily expensive and technically unsolved — a useful reminder of the scale of what is happening 93 million miles away, for free.\u003c\/p\u003e","brand":"Forever Stamp Center","offers":[{"title":"100 Stamps (5 Sheets)","offer_id":47100607758535,"sku":"ST21-A17-5","price":19.99,"currency_code":"USD","in_stock":true},{"title":"300 Stamps (15 Sheets)","offer_id":47100607791303,"sku":"ST21-A17-15","price":54.99,"currency_code":"USD","in_stock":true},{"title":"500 Stamps (25 Sheets)","offer_id":47100607824071,"sku":"ST21-A17-25","price":89.99,"currency_code":"USD","in_stock":true},{"title":"1000 Stamps (50 Sheets)","offer_id":47100607856839,"sku":"ST21-A17-50","price":149.99,"currency_code":"USD","in_stock":true},{"title":"5000 Stamps (250 Sheets)","offer_id":47100607889607,"sku":"ST21-A17-250","price":699.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0770\/6250\/4647\/files\/C6630A86-5737-63E6-0768-F4FEDB5689CD-1-1-800x800_000d8ccc-74ce-48b3-aed9-14cf8caaf2b7.jpg?v=1788604401","url":"https:\/\/www.foreverstampcenter.com\/products\/forever-stamps-2021-sun-science-educational-nature-series-first-class-postage","provider":"center","version":"1.0","type":"link"}