Is the universe infinite? We can't say unless we can grasp the concept of infinity. Let me help you with that:
"The mass of the earth is 5,980,000,000,000,000,000,000,000,000 grams. There are 133,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 atoms in Earth. Pi is 3 followed by a decimal of over 52,000,000 digits. From Zimbabwe comes a 100,000,000,000,000 dollar note. In late 2008, with that nation battered with inflation, it was worth about $1.50 in U.S. The fastest super-computer has a rate of 20,000,000,000,000,000 calculations per second.
You'll have to run it about a day and a half, for it to equal all the grains of sand on all the world's beaches. That's about 60,000,000,000,000,000,000,000. That's roughly the amount of stars n the visible universe. Atoms in the visible universe? That's about 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,00,000,000,000,000,000,000
Cubic centimeters? A mere 100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000. Then there's the largest number ever used. Grahams numbers is a calculation of angles in a type of hypercube. If you divide the universe into the smallest units known, called plank volumes, the total of those units wouldn't get you anywhere close to Grahams number. But its still nowhere close to the ultimate ceiling, infinity." - That guy that narrated
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So, is the universe infinite?