{"product_id":"gravity-probe-b-plate-034-physics-poster","title":"Gravity Probe B – Plate 034 Physics Poster","description":"\u003cp\u003ePlate 34 speaks for itself: \u003cem\u003e“Earth drags spacetime, 37 milliarcseconds a year.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eGravity Probe B carried four superconducting gyroscopes in polar orbit. Their axes slowly turned from the geodetic effect and from frame dragging by Earth's spin.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eΩ_fd = G I ω \/ (2 c² r³)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eΩ_fd: frame-dragging precession rate (orbit-averaged, polar), rad s⁻¹\u003c\/li\u003e\n\u003cli\u003eG: gravitational constant, m³ kg⁻¹ s⁻²\u003c\/li\u003e\n\u003cli\u003eI: Earth's moment of inertia, kg m²\u003c\/li\u003e\n\u003cli\u003eω: Earth's angular speed, rad s⁻¹\u003c\/li\u003e\n\u003cli\u003ec: speed of light, m s⁻¹\u003c\/li\u003e\n\u003cli\u003er: orbital radius, m\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e37.2 ± 7.2 mas\/yr (polar-orbit average); GR predicts 39.2. Polar orbit at 642 km, launched 2004.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eC. W. F. Everitt et al., Phys. Rev. Lett. 106, 221101 (2011).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 034, “Gravity Probe B”: the pixel-art plate with its slogan “Earth drags spacetime, 37 milliarcseconds a year.”, 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":50961883431015,"sku":"71545107277242200558","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50961883463783,"sku":"86030330886558664439","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50961883496551,"sku":"19757455006673328919","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50961883529319,"sku":"10777164860734980429","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50961883562087,"sku":"45356709435097070836","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50961883594855,"sku":"31023927567135985923","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50961883627623,"sku":"10421604980493172437","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50961883660391,"sku":"19880020873905019543","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50961883693159,"sku":"21577283268115563113","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/579535022613002376_2048.jpg?v=1793633670","url":"https:\/\/pixelatedphysics.com\/sv\/products\/gravity-probe-b-plate-034-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}