How do these two characteristics impact a star's apparent brightness?

size. | distance from earth
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The apparent brightness of a source of electromagnetic energy decreases with increasing distance from that source in proportion to the square of the distance a relationship known as the inverse square law.

Explanation:

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d.) gravity pulled particles of dust and gas together to form planets.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl