Humanity is going to have problems far sooner than the heat death of the universe - the increasing heat of the sun. As our sun enters the last half of its life

Humanity is going to have problems far sooner than the heat death of the universe - the increasing heat of the sun. As our sun enters the last half of its life it's going to start burning hotter (and no, this is not the cause of today's global climate change). In 100 million years or so earth will be uninhabitable by most mammals, certainly humans. In 1 billion years the oceans will have boiled away. So all humanity has to do is move to another star, right? Well, that's not a long-term solution. First, our sun is a main sequence star. It's very average, meaning most of the stars in our galaxy are just like it and they're the same age, i.e. they're going to "die" at roughly the same time. The inner, rocky planets we prefer will be uninhabitable. We might find a moon on an outer gas giant to our liking. But all that supposes we could even get there - which isn't likely. Space is mind-boggling vast. The nearest star is 4 light years away. The average star you see in the night sky is 60 to 100 light years away. Even if we had the technology to travel at (near) the speed of light it would take six years to get to the nearest star. Why? It takes one year at 1G acceleration to reach the speed of light and one year of 1G deceleration to slow down to reach your destination. Of course you're going to need a shield to protect you from the gamma rays you just transformed all the light you're approaching into and since you need more shielding to protect from the gamma rays you need more energy to maintain the acceleration - you quickly realize you can't get enough energy to power even a modest spacecraft. Sadly then, it looks like going to the stars is out of the question. Our sun is it, and in 100 million years or so it will make our home planet uninhabitable (though we're trying our best to make it uninhabitable long before that!) You have to realize humanity is going to go extinct. There's a maximum timeline for our existence. That's why I say AI and robots will be our progeny. They're the ones that will have to contend with the heat death of the universe.