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There are three factors, actually.

The star's size and temperature determine the absolute magnitude, or how bright the star really is.

Those two factors can be considered as one - the star's absolute magnitude.

The absolute magnitude combined with our distance from the star determines its apparent magnitude, or how bright the star appears to be from Earth.

So, a big, hot, super bright star very far away may have the same apparent magnitude as a small, cool star that's fairly close to the Earth.

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11y ago

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