Earth After the sun have died off!

Sun is also considered as the centre of the solar systems and one of the most important objets in the universe known for being able to give lif on planets as we know it, but lets see what happens if it it was gone and what might happen to planets that host life as we know it.
First of all all objects are in the need of light in the universe as we know it. Fist of all ,all stars have average lifecycle of trillions of light years across.
So what could happen to all the planets that have light?

• If all the planets  had life some  on it but not that intelligent to save themselves during some bad astronomical events in the universe .
• Welll that could happen to them is that based on the velocity how much is capaable of reaching the planet, they will not know due to the speed.
• For example, here because we are third closest planet to the  sun, and takes about 8 minutes to reach up us, and then so it will be completetly dark around here, only light that we can think off it can our chemical centers, In chemical inudsties. as we know it.