앎과 지식의 상대성.
우주의 크기. 1922년, 10만 광년이면 우주 끝에 도달. 현재 930억 광년. 2100년에는 우주 크기는 얼마일까?
에드윈 허블 망원경의 발명으로 Milky Way 은하계는 무수한 은하계들 중 하나라는 것을 알게됨.
관찰가능한 우주의 크기는 횡단 거리가 930억 광년.
관찰도구의 발달로 '진실'과 '진리'가 달라지다.
A century ago, in 1922, the entire known universe was thought to be just 100,000 light-years across—about the size of our Milky Way. Back then, astronomers believed our galaxy was the entire universe. They had no idea what lay beyond.
Then came the game-changer. Edwin Hubble’s discoveries in the 1920s revealed that the Milky Way was just one of countless galaxies, and the universe was expanding. Fast forward to today, and our cosmic map has exploded in size—the observable universe is now estimated to be 93 billion light-years across! 🤯
The universe didn’t physically expand that much in 100 years—we just finally realized how vast it already was. The discovery of cosmic expansion, dark energy, and the Big Bang theory completely changed our understanding. Light from galaxies billions of years away is still reaching us, showing us a universe that keeps getting bigger the more we look.
Think about this: The universe we know today is likely just a fraction of the whole thing. Beyond what we can see, space could stretch on infinitely.
A hundred years from now, how much bigger will our universe become?
