sun

why is the sun important to us on earth?

nothing is more important to us than sun on Earth,becausewithout the sunlight of it the Earth would have just been a big tilted iceball roaming freely in the space.Or maybeit would have been in the gravity of some other star and then maybe some othe creature would live on it, not us.

some facts about sun

The Sun accounts for 99.86% of the mass in the solar system.
Over one million Earth's could fit inside the Sun.
One day the Sun will consume the Earth,but dont worry,it will happen after trillions of year.
The energy created by the Sun's core is nuclear fusion.
The Sun is almost a perfect sphere.
The Sun is travelling at 220 km per second.

why does the spaceis totally dark when there our so many sousource of light

the answer is that it is dark black in space because there is nothing in space which can reflect the light back. The bodeis which are there, are visible.

why dosen't the sun die

The sun gives energy to life on Earth, and without this star, we wouldn't be here. But like most things in space, even stars have limited lifetimes, and someday our sun will die.
You don't need to worry about this solar death anytime soon, though. Inside the sun, a churning fusion engine fuels the star, and it still has a lot of fuel left — about 5 billion years' worth.
Stars like our sun form when a huge cloud of gas (mostly hydrogen and helium) grows so large that it collapses under its own weight.