It might sound like a scene from a science fiction movie, but the threat of an asteroid hitting Earth is more realistic than you might expect. One asteroid in particular, named 99942 Apophis, has been closely monitored by scientists since its discovery in 2004. For a time, there was real concern that it could strike Earth in the year 2029. Current predictions suggest it will pass us safely. But what if those predictions are wrong? What if Apophis were to crash into Earth this year?Here are seven major consequences we could face if an asteroid hit Earth in 2024.