What Do We Mean When We Say That the Universe

question 73

Multiple Choice

What do we mean when we say that the universe is expanding?

• A)Everything in the universe is gradually growing in size.
• B)Within galaxies,average distances between star systems are increasing with time.
• C)The statement is not meant to be literal;rather,it means that our knowledge of the universe is growing.
• D)Average distances between galaxies are increasing with time.

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