There is mainly two elements are present in the sun and the stars. They are : Hydrogen(H) and Helium(He).

The gases used in light bulbs are known as inert gases.  An inert gas is a non-reactive and extremely resistance to chemical change.  Due to inert nature, Argon (Ar) and Neon (Ne) do not allow a filament to catch fire in a electric bulb.

Graphite is the mineral a form of carbon.  It has layer type structure.  In between two layers of graphite, weak Vander waal’s force exists and this was making graphite as slippery.  Hence, graphite is used as lubricant.