Space-based solar power. Illustration of satellites harvesting energy from sunlight and beaming it down to Earth, perhaps via microwaves. Such satellites would likely be in highly elliptical orbits, ensuring that they stayed above the same hemisphere...

Space-based solar power. Illustration of satellites harvesting energy from sunlight and beaming it down to Earth, perhaps via microwaves. Such satellites would likely be in highly elliptical orbits, ensuring that they stayed above the same hemisphere...

To harness much more of the Sun's abundant power, our descendants have encased the star in a cage of billions of moving parts - a Dyson swarm. This energy can then be transmitted to wherever it is needed in the Solar System....

To harness much more of the Sun's abundant power, our descendants have encased the star in a cage of billions of moving parts - a Dyson swarm. This energy can then be transmitted to wherever it is needed in the Solar System....

... only expanding, but that the rate of expansion itself is accelerating. This is postulated to occur due to a mysterious dark energy. ...

... nhouse gases. This kept the surface warm enough for some liquid water, despite the Sun only emitting some 70% of its current energy output. Despite these hellish conditions, life began on Earth during the Archaean Eon. ...

... nhouse gases. This kept the surface warm enough for some liquid water, despite the Sun only emitting some 70% of its current energy output. Despite these hellish conditions, life began on Earth during the Archaean Eon. ...