Time is relative. In the end, our planet is just a blip in the universe and when the sun goes it will be gone, and the universe will be unchanged, the same as if Earth had never existed...

As far as the point, well, philosophy is fun. Why is there something when there could be nothing? Why does the universe even exist? What's the point of planets? What's the point of life on planets? What's the point of human evolution? Maybe there are no discrete points, aka a continuum, and it's all pointless. Or maybe there are discrete points, indivisible subatomic particles. Or maybe we're all in a simulation?

For some the point is to continue the evolutionary process by breeding and spawning, like the salmon in the rivers do. For others the point is to amass as much wealth and power as possible so that they can be at the top of the human social hierarchy and enjoy alpha monkey status. Some invent supernatural beings and imagine life without end in an afterlife paradise. For others, the point is to push their minds and bodies to their limits by creating art, studying science, exploring the natural world, inventing technologies and so on.

Probably the saddest crowd is those for whom the point of life has become little more than buying the useless garbage the advertisers tell them to buy. It's not healthy for the mind and it's not healthy for the body, and it's leading to environmental catastrophe. Many people are miserable because they can't buy all the products they're told they're supposed to buy in order to acquire the patina of success (the antidote is to adopt an indifferent attitude towards advertising and its psychological manipulation strategies).