Where does the heat that warms your body come from?

The catabolism of sugar, fat, and protein with oxygen to make ATP (basically transferring energy from chemical bonds to a different type of bond that is used by the body's cells as fuel) is not 100% efficient. This produces heat and thus warms our blood. The blood circulates to your core and warms your body.

This galaxy belongs to the elliptical galaxy category.

Explanation:

This is because it does not have spiral arms. Moreover, it has a smooth light whose brightness decreases as it stretches out from the center.