US 2021 Sunspots : Sun Science 55c. Scott. 5604


US 2021 Sunspots : Sun Science 55c. Scott. 5604


Series: Sun Science (2021)

Stamp details: Coronal Loops

Issued date: 18-06-2021 (dd/mm/yyyy)
Face value: 55c.
(FOREVER º - No Face Value)

Format: Pane of 20

Emission: Commemorative
First Day City: Greenbelt, Maryland

Catalogue No:-
Scott (USA): 5604
Michel (Germany): 5837BA
Yvert et Tellier (France): 5446

Designers: Antonio Alcalá

Dimensions (height x width):
31.25mm x 31.25mm

Printer: Banknote Corporation of America
Print Method: Flexographic, Foil Stamping

Perforation: Serpentine Die Cut 10¾ x 10½

Stamp Colors: Multicolored
Gum type: Self-Adhesive

Themes: Sun, Astronomy

Total print: 3,000,000 (estimate)

Note: Stamp from se-tenant block of ten.

Face value US$0.55 on day of issue.

Description:- Sunspots are phenomena on the Sun's photosphere that appear as temporary spots that are darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity.[2] Their number varies according to the approximately 11-year solar cycle.
Source: en.wikipedia.org/wiki/Sunspot