Transformers Exhibition Part 05: Zone 3 Desert Skirmish

Behold! The Autobots are fighting against the Decepticons to prevent them from activating an ancient device called the Star Harvester. It is able to harness energy from a star and destroy it in the process. All it requires is the Matrix of Leadership. If the Decepticons were to succeed, our Sun will be destroyed and all life will be wiped out!

 
Megatron and Optimus Prime

 
Skids

 
Mudflap

 
Second Bumblebee statuette

Stars are formed when a cloud of gas collapses under the force of gravity. When the core of a star is compact enough, the gas atoms will fuse to release tremendous amount of energy in a process called nuclear fusion. The life of a star depends on the fine balance between the outward pressure produced by the fusion and the inward pressure exerted by gravity.
In simple term, a star continues to burn as long as there is sufficient amount of gas at the core. The heavier a star is, the faster the fusion is and its lifetime will be shorter. When the star exhausts its fuel, it will either explode in a supernova explosion to become a black hole, a neutron star, or collapse into a white dwarf.