'Potentially hazardous' asteroid BIGGER than the Space Needle will narrowly avoid Earth as it passes by today Asteroid 2021 KT1 will fly safely past Earth on June 1 at a distance of roughly 4.5 million miles The 'potentially hazardous' space rock has a diameter between 492 and 1,082 feet, or roughly as tall as the Eiffel Tower It is considered a 'potentially hazardous object' as it has a diameter larger than 492 feet and will come within 4.6 million miles of Earth The asteroid will fly past Earth at a speed of 40,000mph at 10:24 EDT 201 KT1 will next make a close approach to Earth on May 19, 2058 and again on June 20, 2061