KEY POINTS NASA detected four asteroids approaching Earth The biggest asteroid in the group measures 180 feet wide All four asteroids will approach Earth this weekend NASA’s automated asteroid tracking system has detected four near-Earth objects that are expected to approach the planet this weekend. According to the agency, the biggest asteroid in the group is about as big as the Leaning Tower of Pisa in Italy. The first asteroid that will approach Earth this weekend has been identified by NASA’s Center for Near-Earth Object Studies (CNEOS) as 2020 FK. As indicated in CNEOS’ database, this asteroid has an estimated...