India, July 29 -- Have you ever wondered how Earth's place in the cosmos is ascertained? Turns out, astronomers use faint signals sent from distant black holes to measure Earth's position in the universe with exceptional accuracy. These black holes are located in the hearts of galaxies and their powerful radio waves reach our planet after traveling for millions of years. Fascinating, right?

Scientists record these signals using radio telescopes, then use a technique called "geodesy" to synchronise measurements from stations all across the world. This network allows them to track Earth's motion and changes in its rotation. These measurements support key technologies like GPS, satellite navigation, Internet timing, and global communication...