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STAGE 1: Main Sequence Stars that are much heavier than the sun start off as hot white, blue-white or blue stars, rather than yellow stars like our sun. They last only a short time compared to the sun.
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STAGE 2: Red Supergiant Phase After the star depletes the hydrogen in its core and moves off the main sequence, the core contracts and heats causing the outer layers to expand. The expansion of the outer
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STAGE 3: Supernova Stage In the final moments of the star's life, nuclear fusion produces an iron core. No energy can be gained by fusing iron into heavier elements. There is now no energy source to sustain
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STAGE 4a: Neutron Star After the supernova blast blows off the outer layers of the star, all that is left is the central core. The core now contains a mass between 1.4 and 3.0 times the sun's mass but
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STAGE 4b: Black Hole If the central core, that remains after the supernova blast, is greater than 3 times the sun's mass, the internal pressure cannot halt the gravitational collapse. The core will continue
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Even though the sleeping man is no longer on the bed, you can still see where he was lying down. The heat from his body warmed up the bed sheets which are now radiating infrared light toward your eyes.
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All warm objects (not just people) radiate in the infrared. Warmer objects give off more infrared radiation. Very hot objects radiate other types of light in addition to infrared. Click on the picture
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