Why does Antares appear less bright than the sun

Antares is 15 times as huge as the Sun, at least. In a rush, such a heavy star burns into the nuclear fuel at its core. But there's no way at any given moment to guess how bright the star will be. That could mean that it's not the whole surface that pulses, but hot gas blobs of individuals.

Explanation:

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sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate