Source: wikibot/gravity-probe-b
= Gravity Probe B
{wiki=Gravity_Probe_B}
Gravity Probe B was a satellite-based experiment launched by NASA on April 20, 2004, to test two predictions of Albert Einstein's general theory of relativity: the geodetic effect and frame-dragging. 1. **Geodetic Effect:** This effect describes how a massive body like Earth warps the space and time around it. Gravity Probe B aimed to measure the amount of this curvature.