We all reside on a small planet orbiting a single, middle-aged star that is one of some 200 billion stars in the great swirl of matter that makes up the Milky Way galaxy. Our galaxy is but one of an estimated several hundred billion such structures in the observable universe—a volume that now stretches in…
We all reside on a small planet orbiting a single, middle-aged star that is one of some 200 billion stars in the great swirl of matter that makes up the Milky Way galaxy. Our galaxy is but one of an estimated several hundred billion such structures in the observable universe—a volume that now stretches in all directions from us for more than 270,000,000,000,000,000,000,000 2.7 × 1023 miles.
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