Well, it is actually impossible for the planet to explode, but if it somehow did, the pieces would simply fall back together to reform the planet.
What if the Hollywood movie industry collapsed?
People would see that as a sign of weakness and over-throw him and his entire dynasty.
What if I would be the best-looking guy in the whole world?
You COULD win some sort of beauty contest.
What if the Ottomans never managed to captire Constantinople?
Then this forum would never exist.
What if beluga whales took over the world?
There would be massive numbers of decaying beluga whale corpses on the beaches of the world, due to them trying to invade the land.
What if Earth's atmosphere was suddenly replaced with Venus's atmosphere?
All life as we know it would die out and be called the largest extinction.
What if I had time travel device?