The Planetary Society has offered a reward to those who invent the most accurate system for tracking the asteroid Apophis. In 2029 will pass very close to Apophis Earth, closer to many communications satellites. Yes, they know it will not touch the Earth.
However, they are not so clear what will happen in 2036 when it happens next to Earth. To solve this doubt, they want to implement a specific system to follow Apophis and they have come up with a prize to invent it.