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Carbon has four empty spaces in its outer shell, enabling it to bond to four other atoms.

(It can also bond stably to fewer atoms by forming double and triple bonds.) In other words, carbon has options.

Under very hot temperatures — greater than 100,000,000 Kelvin (179,999,540.6 F) — the helium nuclei begin to fuse, first as pairs into unstable 4-proton beryllium nuclei, and eventually, as enough beryllium nuclei blink into existence, into a beryllium plus a helium.

The end result: Atoms with six protons and six neutrons — carbon.

This method works on once-living organisms, including objects made of wood or other plant material.

Carbon is a long-studied element, but that doesn't mean there isn't more to discover.

Carbon-14 is a radioactive isotope of carbon used by archaeologists to date objects and remains.

When atoms bond, they share electrons in their outermost shell.

The research team named their discovery the buckminsterfullerene after an architect who designed geodesic domes.

The molecule is now more commonly known as the "buckyball." The researchers who discovered it won a Nobel Prize in Chemistry in 1996.

[See Periodic Table of the Elements] Carbon occurs naturally as carbon-12, which makes up almost 99 percent of the carbon in the universe; carbon-13, which makes up about 1 percent; and carbon-14, which makes up a minuscule amount of overall carbon but is very important in dating organic objects.

As the sixth-most abundant element in the universe, carbon forms in the belly of stars in a reaction called the triple-alpha process, according to the Swinburne Center for Astrophysics and Supercomputing.