KIDS QUIZ
SPACE EXPLORATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the term for the sum of all space, matter, and energy that exist, that have existed in the past, and that will exist in the future?
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A. The stars
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The galaxy
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The universe
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The solar system
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Explanation:
Detailed explanation-1: -The universe is often defined as “the totality of existence", or everything that exists, everything that has existed, and everything that will exist.
Detailed explanation-2: -Universe all existing matter and space considered as a whole the cosmos.
Detailed explanation-3: -In the case of a universe that is approximately uniform in space, one can show that this negative gravitational energy exactly cancels the positive energy represented by the matter. So the total energy of the universe is zero."
Detailed explanation-4: -Cosmological constant It is sometimes called a vacuum energy because it is the energy density of empty space – the vacuum.
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