An asteroid between 50 and 130 feet wide will fly by the Earth on Friday on a path closer than the moon's, NASA said this week.
Asteroid 2018 CB is the second small asteroid to buzz by the planet this week, according to NASA.
"Asteroids of this size do not often approach this close to our planet -- maybe only once or twice a year," said Paul Chodas, manager of the Center for Near-Earth Object Studies at NASA's Jet Propulsion Laboratory in Pasadena, California.
NASA said 2018 CB will safely pass the Earth at a distance of 39,000 miles, pretty close by space standards.
On Tuesday, 2018 CC was about 114,000 miles away when it flew by Earth.
The moon is an average of 240,000 miles from Earth.
NASA detects about 1,500 new near-Earth objects a year. Small asteroids pass between the planet and the moon several times a month.
Earth isn't at significant risk of getting hit by any known asteroid for at least 100 years.
- Small asteroid will pass very close to Earth on Friday
- NASA has a new plan to protect Earth from an asteroid strike
- Settle down, guys. A skull-shaped asteroid is not headed for Earth this Halloween
- See the images rover took on asteroid
- Robot sends new images from asteroid's surface
- Día Internacional de los Asteroides: ¿estamos listos si un asteroide golpea la Tierra?
- Earth Day Fast Facts
- Only 117 years 'til this asteroid (possibly) hits us
- Japan to attempt robot landing on asteroid 186M miles away
- Japan's Hayabusa-2 probe touching down on distant asteroid