In 2006, the Laser Relativity Satellite (LRS) was launched into orbit around Earth. The satellite is equipped with a powerful laser that can be used to study the effects of Einstein’s theory of relativity.
The Laser Relativity Satellite is part of a larger project called the Gravity Probe B experiment. The goal of the experiment is to test two predictions of Einstein’s theory of general relativity: 1) That the gravity of a massive body like Earth will cause space and time to warp; and 2) That this warping of space and time will cause moving objects to follow curved paths.
To test these predictions, scientists use the laser on the LRS to precisely measure how much space and time are warped near Earth. They also measure how much the satellite’s orbit is affected by Earth’s gravity. By comparing these measurements with predictions from Einstein’s theory, scientists can learn whether or not general relativity is correct.
So far, the results of the Gravity Probe B experiment have been consistent with Einstein’s predictions. This supports our current understanding of how gravity works and helps us to better understand the Universe as a whole.