Stars
A star is an exploding ball of burning gas held together by gravity. Moslty of Hydrogen and helium. Stars are fueled by the nuclear fusion of hydrogen to form helium deep in their interiors.
The reason why stars are so important is because they have helped humans navigate through Earth . When it was dark these stars would light up the sky giving people light. In addition stars are very important because they make life on Earth.
“There's as many atoms in a single molecule of your DNA as there are stars in the typical galaxy. We are, each of us, a little universe.” - Neil deGrasse Tyson
Stars are born within the clouds of dust and scattered throughout most galaxies. A star takes about 10 million years to be made and about 7 stars are made per year.
The death of stars
While most stars quietly fade away, the supergiants destroy themselves in a huge explosion, called a supernova. Theoretical studies indicate that most supernovae are triggered by one of two basic mechanisms: the sudden re-ignition of nuclear fusion in a white dwarf, or the sudden gravitational collapse of a massive star's core.
Do stars pose a threat to us
Those harmless stars you see may be dangerous!
Usually, stars are too far away to pose a threat to life on our planet. However, some star outbursts could travel for tens or even thousands of light-years. Stars that are close enough to the sun could sabotage Oort cloud objects' orbits and direct them toward the solar system. The Sun, planets, and Kuiper Belt Objects are thought to be enclosed within the enormous spherical shell known as the Oort Cloud.