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Goryan [66]
2 years ago
6

What kind of bond is ca-br

Chemistry
1 answer:
Genrish500 [490]2 years ago
6 0

Answer: Ionic or electrovalent bond

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The age of the oldest stars

How fast distant galaxies are moving away from us

Patterns of background radiation.

Explanation:

The Astronomers calculate the age of the universe by looking for oldest stars, and by measuring the rate of expansion of the universe and back to big bang.

The Astronomers used the techniques like the age of oldest stars, how fast the distant galaxies are moving away from us, patterns of background radiation and along with the Big Bang as reference point, they estimate that the universe may be approximately 12 billion years old.

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<em>suface wave</em>

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<em>hope this helps </em>

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