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Answer :
Final answer:
The estimated percentage of dark matter in the universe is about 27%, not directly observable but inferred from gravitational effects on visible matter. It's fundamentally different from 'normal' matter and its exact composition remains unknown.
Explanation:
The estimated percentage of dark matter in the universe is approximately 27 percent. The rest of the universe is made up of 'normal' matter (approximately 5 percent) and dark energy (roughly 68 percent). Dark matter and dark energy are so-named because they cannot be seen directly; scientists are aware of their existence based on the gravitational effects they have on visible matter.
The exact composition of dark matter remains unknown, but it is fundamentally different from 'normal' matter in that it does not reflect, absorb, or emit light. This makes its detection and study challenging for scientists, but also compels its existence as an explanation for various observable phenomena in the universe, such as the rotation of galaxies and galaxy clusters formation.
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