Rocket can eventually go faster relative to the ground than the rocket exhaust is leaving the back of the rocket. Gravity declines with separation. Orbitting is combination of circular motion and inward force supplied by gravity. Heat 6.1 Wood Stoves Burning is conversion of chemical pot. In air and water convection is the major heating process.
Thick insulation makes temp.
AND it traps air to eliminate convection. At low temperature radiation is small, but if all other heat mechanisms have been reduced, then it can be the biggest remaining energy loss mechanism. That is why thermos bottles work so well at retaining thermal energy. All objects emit radiation. The amount of energy they emit this way depends very strongly on temperature.