Thu, 11/23/2017 - 20:51
Planet Earth is a tiny speck in the galaxy called the Milky Way. Traveling at the speed of light, rough estimates suggest it would take 100,000 light years to traverse. Do consider that a light-year, the distance light travels in a year, is roughly 5.9 trillion miles. Like a ship in an empty ocean earth bound astronomers can peer 13.8 billion light-years in every direction. This places the Milky Way, and our tiny speck, inside an observable sphere 28 billion light-years in diameter. Even this is deceiving. The universe is expanding. Some estimate the diameter of the observable universe to be, more or less, 92 billion light-years.