Scientists are about to send a probe into orbit around Earth to prove -- or disprove -- Einstein's general theory of relativity. Join NPR's Ira Flatow for a look at the Gravity Probe B mission.

From Space.com: After years of technical snags and costly delays, NASA's Gravity Probe B is scheduled for launch in April to test Einstein's theories.

NASA researchers spent nearly 40 years on Gravity Probe B, a satellite designed to test some of Albert Einstein's theories. As the $700 million project winds down, NASA is rejecting a request for ...

Gravity Probe B -- a NASA mission to test two predictions of Albert Einstein's Theory of General Relativity -- is orbiting 400 miles above Earth, and all spacecraft systems are performing as planned.

Gravity Probe B has finally confirmed that the Earth drags spacetime around as it rotates like a spoon twisting in a jar of honey, mission scientist announced at a May 4 NASA press briefing.

After many delays and false starts, Gravity Probe B was finally launched in April 2004. It tested both effects with four gyroscopes consisting of spinning quartz spheres coated with the metal niobium.

It recommended that Gravity Probe B receive no additional funding after its current funding runs out in September. Launched in 2004, the satellite used four precision-engineered gyroscopes to ...

NASA's Gravity Probe B mission, also known as GP-B, will use four ultra-precise gyroscopes to test Einstein's theory that space and time are distorted by the presence of massive objects.

Image: In polar orbit 400 miles above the Earth's surface, Gravity Probe B locks on a guide star. IM Pegasi provides both the initial alignment direction of the spin axes of the four gyros onboard ...

NASA’s Gravity Probe B (GP-B) mission has confirmed two key predictions derived from Albert Einstein’s general theory of relativity, which the spacecraft was designed to test. The experiment ...