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Born; Stage 1
Stars are born in a region of high density Nebula*, and condenses into huge globule of gas and dust and contrats under its own gravity.
* A cloud of gas and dust in outer space, visible in the night sky . -
Baby; Stage 2
A region of condensing matter will begin to heat up and start to glow forming Protostars*. If a protostar contains enough matter the central temperature reaches 15 million degrees centigrade.
* A mass of gass contracting in the early stage. -
Toddler; Stage 3
At this temperature, nuclear reactions in which hydrogen fuses to form helium can start. -
Child; Stage 4
The star begins to release energy, stopping it from contracting even more and causes it to shine. It is now a Main Sequence Star. -
Teen; Stage 5
A star of one solar mass remains in main sequence for about 10 billion years, until all of the hydrogen has fused to form helium. -
Young Adult; Stage 6
The helium core now starts to contract further and reactions begin to occur in a shell around the core. -
Adult; Stage 7
The core is hot enough for the helium to fuse to form carbon. The outer layers begin to expand, cool and shine less brightly. The expanding star is now called a Red Giant. -
Older Adult; Stage 8
The helium core runs out, and the outer layers drift of away from the core as a gaseous shell, this gas that surrounds the core is called a Planetary Nebula*.
* A ring-shaped nebula formed by an expanding shell of gas around an aging star. -
Elder; Stage 9
The remaining core (thats 80% of the original star) is now in its final stages. The core becomes a White Dwarf the star eventually cools and dims. When it stops shining, the now dead star is called a Black Dwarf.