{"product_id":"three-radii-of-a-black-hole-plate-033-physics-poster","title":"Three Radii of a Black Hole – Plate 033 Physics Poster","description":"\u003cp\u003ePlate 33 speaks for itself: \u003cem\u003e“Three circles: no return, light's orbit, last stable orbit.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eAround a non-spinning black hole three radii matter: the event horizon at r_s, the photon sphere at 1.5 r_s where light can circle, and the innermost stable circular orbit at 3 r_s.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003er_s = 2 G M \/ c²\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003er_s: Schwarzschild radius, m\u003c\/li\u003e\n\u003cli\u003eG: gravitational constant, m³ kg⁻¹ s⁻²\u003c\/li\u003e\n\u003cli\u003eM: mass, kg\u003c\/li\u003e\n\u003cli\u003ec: speed of light, m s⁻¹\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor the Sun, r_s ≈ 2.95 km. Schwarzschild, 1916; non-spinning hole.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eK. Schwarzschild, Sitzungsber. Preuss. Akad. Wiss., 189 (1916).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 033, “Three Radii of a Black Hole”: the pixel-art plate with its slogan “Three circles: no return, light's orbit, last stable orbit.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.\u003c\/p\u003e","brand":"Pixelated Physics","offers":[{"title":"9'' x 12\" (Vertical) \/ Matte","offer_id":50961881202791,"sku":"12393098500930290250","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50961881235559,"sku":"31393099402046518907","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50961881268327,"sku":"20607744904508566030","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50961881301095,"sku":"43740238870169187410","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50961881333863,"sku":"92404852083491354748","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50961881366631,"sku":"19486155991186900176","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50961881399399,"sku":"24164078189951485826","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50961881432167,"sku":"34016294718233649025","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50961881464935,"sku":"26037516906129758016","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/9934142535769137393_2048.jpg?v=1793731971","url":"https:\/\/pixelatedphysics.com\/it\/products\/three-radii-of-a-black-hole-plate-033-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}