Space is flexible. It’s been expanding at a measurable rate since the beginning of time. A person could never get to the edge of the universe. If someone traveled outward in a straight line indefinitely, he would come back to where he began.The universe is probably 15 billion years old but the estimates vary. There are more stars in the sky than all of the grains of sand on Earth. Discover the secrets of the universe and learn many interesting and unusual facts.
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