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Gravitational Blueshift Postcard

4.9 out of 5 stars rating
15913 Total Reviews |
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Paper Type
Signature Matte
18 pt thickness / 120 lb weight Soft white, soft eggshell texture
-$0.16
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About Postcards

Sold by
PostcardCreate your own from scratch

Size: Standard Postcard

Create your own vacation-worthy postcard! Any view you’ve seen, any monument you’ve fallen in love with, can all be added to your postcard with our personalization tool.

  • Dimensions: 5.6" L x 4.25" H; qualified USPS postcard size
  • High quality, full-color, full-bleed printing on both sides

Paper Type: Signature Matte

Our Signature Matte paper is a customer favorite—smooth to the touch with a soft eggshell texture that elevates any design. Its sturdy 18 pt weight and natural feel make it the ideal choice for timeless, sophisticated events.

  • Exclusively made for Zazzle
  • Made and Printed in the USA
  • FSC® Certified—sourced from responsibly managed forests that protect both people and planet

About This Design

Gravitational Blueshift Postcard

Gravitational Blueshift Postcard

A multi-colored, fractal representation of gravitational blueshifting; the shifting of light toward the blue end of the spectrum that occurs as photons become more energetic when falling into a gravity well. Customize by adding your own text. Unlike the more commonly known Doppler blueshift, an apparent effect which is the result of motion towards the observer, gravitational blueshift is real, independent of the received angle of the photon. Gravitational blueshift is a natural consequence of conservation of energy and mass-energy equivalence.
FractalFire
Bronze
Artwork designed by
Anchorage, Alaska
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Customer Reviews

4.9 out of 5 stars rating15.9K Total Reviews
14464 total 5-star reviews1012 total 4-star reviews213 total 3-star reviews82 total 2-star reviews142 total 1-star reviews
15,913 Reviews
Reviews for similar products
5.0 out of 5 stars rating
5 out of 5 stars rating
By Ray A.September 30, 2025 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
Very pleased with my order. All my prints were manufactured to a very high standard to my exact specifications and edited additions.
5.0 out of 5 stars rating
5 out of 5 stars rating
By Suzi G.August 16, 2025 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
Fabulous create your own postcard turned out awesome 👍 I love the different colors and balloons a lot! .
5.0 out of 5 stars rating
5 out of 5 stars rating
By Suzi G.September 17, 2025 • Verified Purchase
Post Card, Size: Standard Postcard, Paper: Signature Matte, Envelopes: None
This tropical card is so good 1🙂🙂The colors, borders, text fonts, all added up to 💯% satisfied customer!!!! 👍.

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gravitygeekastrophysicssciencephysicsastronomyspacefractalredcustom
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gravitygeekastrophysicssciencephysicsastronomyspacefractalredcustom

Other Info

Product ID: 256185902535175246
Created on: 6/16/2025, 8:57 AM
Rating: G 
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