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1. Cosmic Inventory. What are the three largest contributors to the density of the universe today?...

1. Cosmic Inventory. What are the three largest contributors to the density of the universe today? What fraction of the cosmos today is made of material that has been studied in a laboratory? Briefly comment on this result.

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Answer #1

Three largest contributors to the density of the universe are-

1. Dark Energy

2. Dark Matter, and

3. Normal Matters, that is the matter by which everything that we can detect is made up of.

In the universe the dark energy constitute about 71%, dark matter 24% and only about 5% fraction of the cosmos today is made of material that has been studied in a laboratory. We are not yet sure what dark energy or dark matter is or what are its constitutes. We are unable to see it but we can feel its gravity and are sure that they must exists.

So, all things that we can see is only about 5% of whole the contents of the cosmos.

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