If You Compared the Diameter of the Earth, Which Is

question 39

Multiple Choice

If you compared the diameter of the Earth, which is 13,000 km, to 1 second, then what unit of time would be equivalent to the size of the Milky Way, whose diameter is 10²¹ m, and what significant milestone would this time correspond to in our evolution?

• A) 2 million years, the length of time humans have existed on Earth
• B) 30,000 years, the length of time humans have lived in North America
• C) 400 years, the length of time humans have been exploring the skies with telescopes
• D) 4 billion years, the age of the Solar System
• E) 14 billion years, the age of the universe

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