Betelgeuse is one of the brightest stars in the night sky even though it is 640 LY from Earth. Barnard's Star, on the other hand, is relatively close but is not visible to the unaided eye.
Which of the following is a correct explanation for this?

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

No, because you are more likely to see volcanic mountains where magma is rising along the mid-ocean ridge spreading to the center.

Freshwater ecosystems

The traditional economy