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.
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
Source: en.wikipedia.org/wiki/Sunspot