Which of the following is most responsible for the success of modern day space missions?
invention of the telescope
acceptance of heliocentric theory
development of liquid propulsion systems
discovery of red shift by the hubble telescope

Why are people not able to skip a dive to the deepest part of the ocean

How does the motion of particles in a gas change as the gas cools

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound