{"product_id":"the-cosmic-budget-plate-074-physics-poster","title":"The Cosmic Budget – Plate 074 Physics Poster","description":"\u003cp\u003ePlate 74 speaks for itself: \u003cem\u003e“Everything we've ever seen is under five percent.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eOrdinary matter, all atoms and everything made of them, is about 4.9% of the universe's energy density. The rest is dark matter and dark energy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eρ_c = 3H₀² \/ (8πG)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eρ_c: critical density, kg m⁻³\u003c\/li\u003e\n\u003cli\u003eH₀: Hubble constant, s⁻¹\u003c\/li\u003e\n\u003cli\u003eG: gravitational constant, m³ kg⁻¹ s⁻²\u003c\/li\u003e\n\u003cli\u003eΩ_b: baryon density fraction, dimensionless\u003c\/li\u003e\n\u003cli\u003eh: H₀ \/ (100 km s⁻¹ Mpc⁻¹), dimensionless\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eΩ_b = 0.02237\/h² ≈ 0.049. ρ_c ≈ 8.5×10⁻²⁷ kg\/m³ ≈ 5 protons\/m³.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e 'Seen' is loose: most ordinary matter is diffuse gas we infer rather than see, so the matter we actually observe is even less.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003ePlanck Collaboration, Astron. Astrophys. 641, A6 (2020).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 074, “The Cosmic Budget”: the pixel-art plate with its slogan “Everything we've ever seen is under five percent.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"9'' x 12\" (Vertical) \/ Matte","offer_id":50962669011047,"sku":"98169293063825060335","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50962669043815,"sku":"22047839000334503932","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50962669076583,"sku":"26759229818152043919","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50962669109351,"sku":"20000291151922231557","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50962669142119,"sku":"15790128902455159799","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50962669174887,"sku":"28996093227347771938","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50962669207655,"sku":"25549699938908363141","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50962669240423,"sku":"22609433384255366491","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50962669273191,"sku":"22108146488602552170","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/2317444885962608052_2048.jpg?v=1793734125","url":"https:\/\/pixelatedphysics.com\/products\/the-cosmic-budget-plate-074-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}