Infrared rays carry more heat radiation than ultraviolet rays, which is why we feel immediate warmth from IR exposure on our skin, while UV rays do not produce the same heat sensation. The sensation of heat involves complex interactions between skin cells and the brain, with IR causing water molecules in cells to vibrate, while UV light can ionize and damage DNA. The discussion also highlights that the source of radiation does not change its properties; both UV and IR behave similarly regardless of whether they come from the sun or another source. Additionally, the atmosphere absorbs significant portions of UV and IR radiation, affecting what reaches the Earth's surface. Ultimately, the peak of heat radiation from the sun is primarily in the visible light spectrum, which is less absorbed by atmospheric molecules.