How large is the observable universe?

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46 billion lightyears

40 billion lightyears

10 billion lightyears

None

answer is A.

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Detailed Solution

Concept- An observable universe is a spherical region of the universe which consists of matter which can be observed from the world.
Our universe is 13.8 billion years old and we know that light takes time to travel through space. So, the observable universe is twice the size of 13.8 billion which is 27.6 billion light years across. The diameter of the visible universe is equal to 93 billion light-years, or more than 46 billion astronomical units, from those objects.
Hence, option 1 is correct.

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