A house-sized asteroid flew past our planet today at about 58 percentage the distance between the Earth and the Moon. The object, known as 2017 YZ4, is estimated to be between 7 and 15 meters( 23 and 49 feet) slightly smaller than the Chelyabinsk meteor that exploded over Russia in 2013.

2017 YZ4 was only discovered on Christmas Day by the Mount Lemmon Survey, which is one of the most successful detectors of near-Earth objects( NEOs) in the world. 2017 YZ4 is an asteroid in the Apollo family, a group characterized by orbits the hell is wider than Earth’s but fly closer to the Sun than our own planet.

The asteroid’s closest approach happened around 10:56 Eastern Time at 224,396 kilometers( 139 433 miles) from the surface of our planet. This is a safe distance , not that we could do much about it since it was only detected a few days ago. It has a speed of 9.5 kilometers( 5.9 miles) per second relative to our planet, so you wouldn’t want to be on its path.

This is 2017 YZ4 orbit around the Sun. NASA

According to NASA’s Center for Near Earth Object Studies, this was the closest asteroid since 2017 WA14 approached Earth on November 21. In 2017, there have been another 51 objects that objective up flying within one lunar distance. All but one, 2012 TC4, were discovered this year as they were approaching our planet.

NASA and other space bureaux utilized 2012 TC4 to analyse the asteroid in detail. They even operated tests to better understand our asteroid warning systems and to determine how capable we would be at fighting off these objects.

While 2017 YZ4 might not pose an extinction-level threat to our planet, we need to remain vigilant as these objects can create widespread damage, like the above-mentioned Chelyabinsk meteor whose shock wave transgressed windows and injured thousands. For this reason, NASA and the European Space Agency have projects monitoring NEOs.

So far, we have discovered only a small percentage of the estimated 1 million hazardous asteroids larger than 30 meters( 100 feet) that inhabit the space around Earth. Only about one in four asteroids larger than 100 meters( 328 feet) have been discovered.

Teams are trying their best to come up with the right tools to protect us against this unlikely but serious threat; however, we currently remain woefully unprepared.

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