Answer . i am in need of your . nasa says the sun’s gravitational force keeps the planets in orbit, why do astronauts float in the space if the sun’s gravitational force exists?

me
consider the mass of the earth and the mass of the sun. then consider the distance between the astronaut and the sun.

you will see that the force of the Earth's gravity is much greater due to the formula above as the very large distance from the sun

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