Stamp collectors and astronomers alike, mark your calendars for June 20, 2017, when a special eclipse stamp will be released.
In honor of the August 21, 2017, total solar eclipse, the United States Postal Service is releasing this special, first-of-its-kind Forever stamp. According to the press release, the stamp will feature an eclipse image from retired NASA astrophysicist Fred Espenak, but the coolest part is the heat-responsive feature.
The stamp will initially feature a total solar eclipse image from Jalu, Libya, on March 29, 2006, but if you hold a finger on top of the stamp, an image of the Moon will be revealed in its place. This responsive stamp is the first time the USPS has ever used ink that respond to body heat.
The eclipse will run west to east from Oregon through South Carolina on August 21. Duration of totality with vary according to locations, but maximum duration will last 2 minutes and 41 seconds in Illinois.