They have now sought to answer a new question: Are Einstein's predictions valid in an environment with a gravitational field far stronger than any found on Earth? Essentially, if LPI is true, then measurements should be entirely blind to whether they occur in a gravity field or not. So, to perform the test, scientists watched the light emitted from S2 as it dove into Sagittarius A*'s strong gravitational field. However, the color of light emitted by hydrogen and the color of light emitted by helium should be reddened by the same amount. Einstein's theory of general relativity was again validated, and the findings were published last month in Physical Review Letters.

Source: CNN April 06, 2019 16:52 UTC