Postage Stamp for Pluto Discoverer Clyde Tombaugh

Astronomer Clyde W. Tombaugh discovered the planet Pluto on February 18, 1930. He was just 24 years old. Pluto was the only planet discovered in the twentieth century and the only one found by an Amer... continue reading »

1,000 signatures Goal: 5,000
All Signatures (1,000 total)
326.
Thomas T 3 May 2011
327.
Jessika S 1 May 2011
328.
Sue W 26 April 2011
329.
Ian A 22 April 2011

"I support American scientists, and american space exploration City and State LA, CA"

330.
Sara R 11 April 2011
331.
Peter T 3 April 2011

"В City and State Long Beach, CA"

332.
Shaynee R 19 March 2011
333.
Laura Talll 7 March 2011
334.
Liz F 5 March 2011
335.
Tori M 27 February 2011
336.
Rachel M 16 February 2011
337.
Michelle V 11 February 2011
338.
Jennifer M 3 February 2011
339.
Carlos G 31 January 2011

"Pluto is a real planet.....I was born there!"

340.
Mike A 23 January 2011
341.
Ana Mc 12 January 2011
342.
Roland E 30 December 2010
343.
Jason J 30 December 2010
344.
Danna S 23 December 2010
345.
Rachelle R 21 December 2010
346.
James Ag 27 November 2010
347.
Jane A 27 November 2010
348.
Denise V 20 November 2010
349.
Josh H 18 November 2010
350.
Stephanie P 17 November 2010

"В City and State corona, ca"

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