The term 'observable Universe' refers to which region?

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Multiple Choice

The term 'observable Universe' refers to which region?

Explanation:
The thing being tested is how far we can observe in the universe given how light travels and how long the universe has existed. The observable universe is the portion of the cosmos from which light has had time to reach Earth since the Big Bang. Because the universe is about 13.8 billion years old and space has been expanding, that observable region extends to roughly 46 billion light-years in radius. We may infer there’s more beyond that horizon, but we can’t observe it with the light we currently have. So the best description is the region of space we can detect from Earth. It’s not the entire universe, and it isn’t about other dimensions, the Local Group, or the vacuum itself.

The thing being tested is how far we can observe in the universe given how light travels and how long the universe has existed. The observable universe is the portion of the cosmos from which light has had time to reach Earth since the Big Bang. Because the universe is about 13.8 billion years old and space has been expanding, that observable region extends to roughly 46 billion light-years in radius. We may infer there’s more beyond that horizon, but we can’t observe it with the light we currently have.

So the best description is the region of space we can detect from Earth. It’s not the entire universe, and it isn’t about other dimensions, the Local Group, or the vacuum itself.

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