NASA has been monitoring an asteroid called Apophis for 17 years. They discovered the 335-metre space rock in 2004 and put it on their list of most hazardous asteroids. They originally said it could kill over 10 million people if it hit Earth in 2029. However, their latest prediction is that Earth will be safe from it for the next 100 years. It will come within 20,000 miles of Earth on April 13, 2029, when it will be at its closest point to the planet. The scientists used radar to predict the asteroid’s orbit around the sun. The space rock is currently 10.6 million miles away from Earth.