Um someone please answer

Black hole, red giant, nebula, white dwarf I believe (from top to bottom)

Black hole, white dwarf, red giant and nebula

Its in the national history museum and you can't se the original because its locked away in a vault 

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