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Asteroid Deflection Strategies
- Long lead time is crucial to divert an asteroid, using methods like a gravitational tractor or altering reflectivity.
- Blowing up an asteroid is risky and inefficient; soft nudges are more practical with enough preparation.
Universe's Likely Endless Expansion
- The universe is likely to expand forever due to dark energy, causing galaxies to drift apart and leading to a heat death.
- Eventually, stars burn out, black holes evaporate, and the universe ends cold, dark, and empty.
Milky Way-Andromeda Collision
- The Milky Way will merge with Andromeda in about four billion years, creating spectacular star formation and tidal tails.
- Most stars, including our solar system, likely won't collide directly due to vast space between stars.