The European Space Agency's upcoming Ramses mission aims to study asteroid Apophis, which will approach Earth closely in 2029. While new findings suggest a slim chance of collision, the odds remain extremely low.

Four enormous asteroids, including one with the potential to wipe out an entire city off the map, are making a close flyby of Earth on Thursday. Deemed potentially hazardous, each will come within 30 miles of our planet in just a span of 12 hours.

Four "potentially hazardous" space rocks, which are between 100 and 580 feet across, will all make their closest approaches to Earth within less than 12 hours of one another on Thursday (Oct. 24). Two of them were only discovered earlier this month.