The universe is vast. On the average, it is about 140 million miles to Mars, which is our next-door neighbor. Considering the broader solar system (from Neptune to the sun), if we were to throw a dart at the solar system, the odds of hitting anything would only be about one in 10 million. Further out, the next closest star in our galaxy is four light years, or tens of trillions of miles, away. Andromeda, the next closest galaxy, is…
Sara S TolsmaJanuary 1, 2019