There are two massive asteroids that will fly past Earth this week.
Asteroid (415029) 2011 UL21
Size: Approximately 7,600 feet long
Distance from Earth: It will pass by Earth at a distance of more than four million miles (over 17 times further than our moon).
Visibility: Visible with small telescopes through Sunday, appearing brightest on Friday.
Asteroid 2024 MK:
Size: Between 400 and 850 feet long
Distance from Earth: It will fly significantly closer, passing at about three quarters the distance to the moon.
Visibility: Best view from Hawaii or South America, but also visible from the southern United States.