: For long-term survival, scientists are investigating propulsion technologies that could reach a "second Earth" in another solar system. This would require breakthroughs in speed and sustainability that currently border on science fiction.
: Some theories suggest physically moving the Earth further away from the Sun using gravitational assists from asteroids or other celestial bodies to keep our planet within a safe temperature range. Through.the.Wormhole.S04E03.Can.We.Survive.the....
The episode establishes that while the Sun is currently the source of all life on Earth, it is also a ticking time bomb. In approximately 5 billion years, it will exhaust its hydrogen fuel and begin burning helium, causing it to expand into a red giant. This expansion will likely swallow Mercury and Venus, and at the very least, turn Earth into a scorched, airless rock. Strategies for Survival The episode establishes that while the Sun is