Your fact is not right!!! As we go higher up in the skies, it becomes the opposite - colder because there is less oxygen and air. Proof - if going higher from the earth. the temperature becomes warmer, then why are there snow up in the mountains?? Why do the mountain-climber take oxygen-cylinder and wear warm clothes??? So, after clear observation, we see that as higher we go, the less the temperature. If you tell going higher up into the space, we cant even feel anything, because we would need space suits, or else, because of harmful gases out in the space, we will rot up and die or else because of the high pressure, we would burst up and die.