USPS Sun Science One Sheet Forever Stamps - Booklet of 20 First Class Forever Stamps

  These forever stamps highlight amazing views of the Sun from a spacecraft that has been monitoring the Sun 24-hours a day for more than a decade. SDO views the Sun in 10 different wavelengths of light covering the visible, ultraviolet, and extreme ultraviolet bands of the light spectrum.   SDO views the sun in 13 different ways, using two different onboard instruments. SDO has recorded hundreds of millions of images from the Sun, showing us different views of the visible surface all the way out to the extended part of the Sun’s atmosphere called the corona. The part of the solar atmosphere that can be seen from the ground during a total solar eclipse.   Features: These stamps can mail letters, envelopes, and others, They can cover the international rates the first time, USPS serves any country with a one-ounce letter. One stamp is one ounce. Forever Stamps: These postage stamps are valid USPS forever postage stamps that can be used at any time, you can send mail no more than 1 ou