His idea is that an advanced civilization could build a sphere that emits waste radiation in a specific direction. This radiation would accelerate the sphere—and the star it contains—in the opposite direction.”

I’m not sure about the process of building a sphere around ‘stars’, but the idea is very exciting. However, comparing the whole universe, how many stars should be covered with spheres? 100, 1000, 100000000 ?! I don’t think the only possibility to use this idea is just for the stars lost in the horizon. The expelled radiation can give enough thrust to spacecrafts, only if that radiation is collected and transmitted to the busters. Agh! We’re so little for the universe!

An advanced civilization could resist the accelerating expansion of the universe