Earth is the third planet from the Sun and it is the only planet known to sustain life. The continents make up less than one third of Earth's total surface and approximately 70% of the crust is covered by water. The photo on the front of the card was taken by NASA (of course?). The stamp (upside down) was issued in January 2013 by USPS and it's a 3D digital work by the Italian artist Leonello Calvetti.
You have many interesting postcards with similar stamps - great :))
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