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STAGE 1: Main Sequence High mass stars enter the main sequence as hot white, blue-white or blue stars. Their lifetimes on the main sequence are much shorter than low mass stars. A 20-solar mass star will
...more 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
...more 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
...more 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
...moreSTAGE 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
...more 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.
...more All warm objects radiate in the infrared. The warmer the object, the higher the frequency and intensity of the radiation. Very hot objects give off other types of radiation in addition to infrared. Click
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