Although the entire universe may be much larger than our observable universe, we can see only within our observable universe. The "boundary" of our observable universe is called .

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The "boundary" of our observable universe is called the cosmological horizon. The lookback time refers to the amount of time it takes for light to reach us from a distant object, the Big Bang refers to the initial event that created the universe, and the Hubble Deep Field is a famous image of a small portion of the universe taken by the Hubble Space Telescope.

Although the Entire Universe May Be Much Larger Than Our