STAR LIFE CYCLE

Protostars initially form from dust and gas clouds spiraling in together due to the force of gravity.

When temperature gets high enough, hydrogen nuclei begin to undergo what to form helium nuclei and give out massive amounts of heat and light?

Once a star has been formed it immediately enters a long stable period where the heat created by the [blank_start]nuclear fission[blank_end] provides [blank_start]outward[blank_end] [blank_start]pressure[blank_end] to balance the force of [blank_start]gravity[blank_end] pulling everything [blank_start]inwards[blank_end]. The star maintains this energy output for millions of year due to the massive amounts of [blank_start]hydrogen[blank_end] it contains. In this stable period it is called a [blank_start]main sequence star[blank_end] and it lasts for [blank_start]billions[blank_end] of years.

What star emits no light?