It sounds like a joke set: If radio waves give you radar and sound to give sonar, why do you get gravitational waves?
The answer could be “GRADER” – “radar” of gravitational waves – future technology that could use the reflection of gravitational waves to map the invisible universe, say researchers in a paper hosted by Physical Review Letters. By observing these signs, scientists can discover dark or dull objects and unusual stars and learn in-depth.
Astronomers use frequent gravitational waves – moving waves in space and Time itself, first discovered in 2015 – to view catastrophic events that are difficult to read-only in light, such as the combination of two black holes (S.N.: 2/11/2016).
But physicists are also aware of the seemingly insignificant property of gravitational waves: They can change course. Einstein’s theory of gravity holds that the atmosphere is twisted and turned, and any wave that passes through this orbit would change direction. In conclusion, when something releases gravitational waves, part of the signal comes straight to Earth. Still, the rest may come later – like the echo – after taking long distances to bend the star or anything else heavy.
Scientists have long speculated that these later signs, known as “gravitational glints,” would be too weak to detect. But physicists Craig Copi and Glenn Starkman of Case Western Reserve University in Cleveland, Ohio, took a step back: Using Einstein’s theory, they calculated how strong the signal would be when waves propelled into a gravitational force within the star itself.
“What is shocking is that it seems to be getting a much bigger result than you expected,” Copi said. “It’s something we are still trying to understand, where it came from – or unbelievable, or, because it seems too good to be true.”
The team says that if the magnetic field were illuminated with such intensity, astronomers could use it to track the galaxy’s interior. Researchers could even look at galaxies that could not be seen in the atmosphere, such as gloves on the black or the neutron stars on the other side of the visible universe.