eli5 why we never hear about supermassive objects which aren’t hot/bright

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For example, some giant “planet” the size of our sun which has a surface like the moon, floating through space in darkness.

Tangentially, how are we sure that black holes aren’t these? Are we misinterpreting absence of light as black holes when instead they could just be large dark objects?

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Anonymous 0 Comments

The simple explanation is that large mass causes intense gravity so atoms get squished which causes friction, and friction causes heat.

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