Sexy Stars, Heavenly Bodies, and Crab Nebula

There are porn stars in the heavens all around us. 

Let's investigate a few and explore quick facts about them. 

Many stars are composed of gas, dust, and other materials "clump" together to form larger masses, which attract 

further matter, and eventually will become 

massive enough to become stars.

Many nebulae or stars form from the gravitational 

collapse of gas in the interstellar medium.

The size of these nebulae, known as HII regions, varies depending on the size of the original cloud of gas. 

New stars are formed in the nebulas. 

The formed stars are sometimes known as a 

young, loose cluster. 

Some nebulae are formed as the result of  supernova explosions, the death throes of massive, short-lived stars. The materials thrown off from the supernova explosion are ionized by the energy and the compact object that it can produce. 

One of the best examples of this is the Crab Nebula. The supernova event was recorded in the year 1054. The compact object that was created after the explosion lies in the center of the Crab Nebula and is a neutron star.