The Orlando Science Center will unveil a solar eclipse stamp that transforms into an image of the moon from the heat of a finger.

The center was chosen as one of several locations around the country to show an enlarged version of the United States Postal Service’s Total Eclipse of the Sun stamp. The unveiling will be at 1 p.m. Thursday.

The stamp is USPS’ first thermochromic ink stamp, which uses the body heat of a thumb or finger to reveal an underlying image of the full moon. The image reverts to the eclipse once it cools. The reverse side of the stamp shows the path across the United States of the upcoming August 21 total solar eclipse and gives the times that it will appear in some locations.

This will be the first time in nearly a century that U.S. residents will experience a total solar eclipse. The last U.S. total eclipse was in 1918.

A total eclipse of the sun occurs when the moon completely blocks the solar disk from view, casting a shadow on Earth. The 70-mile-wide shadow path of the eclipse will cross the country diagonally, appearing first in Oregon and exiting some 2,500 miles east and 90 minutes later off the coast of South Carolina, passing through portions of 14 states.

Retired NASA astrophysicist Fred Espenak, who is considered the world’s leading authority on total solar eclipses, took the photograph that is used on the stamp. It is a total solar eclipse seen from Jalu, Libya, on March 29, 2006.

A pane of 16 Total Eclipse of the Sun stamps are available for $7.84 at post offices nationwide and can be pre-ordered for home delivery. The stamp is a Forever stamp, which is always equal in value to the current first-class mail 1-ounce price.

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