Instead of digging deep underground to find #fossils & ruins, | ASTRONOMY
Instead of digging deep underground to find #fossils & ruins, astronomers look up to the #night sky. The oldest fossils found on Earth are roughly 3.5 billion years old. The light from the Musket Ball Cluster took a staggering ~5.1 billion years to reach us!
X-ray (Chandra): NASA, CXC, UCDavis/W.Dawson et al.; Optical (#Hubble): #NASA, STScI, UCDavis/W.Dawson et al.
