Jem_Facts_ on Instagram: "When astronomers detected this flash, they were essentially observing a Cretaceous period event — the light from the stellar explosion had been traveling through space for over 100 million years. This isn't a metaphor: telescopes enable us to peer into the Universe's past thanks to the finite speed of light. Every observation of distant galaxies represents archaeology in action. Even more astonishing: according to general relativity, warping spacetime could theoreticall