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Nebula
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Did you know that the center of a Protostar (the star in the middle of a nebula) is called a Nuclear Furnace? So you can call that the star's "heart." The heart of a star is a furnace. Not much unlike the human heart.
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What caused me to undertake the catalog was the nebula I discovered above the southern horn of Taurus on September 12, 1758, while observing the comet of that year. ... This nebula had such a resemblance to a comet in its form and brightness that I endeavored to find others, so that astronomers would not confuse these same nebulae with comets just beginning to shine. I observed further with suitable refractors for the discovery of comets, and this is the purpose I had in mind in compiling the ca
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