Can asteroids hit human on Earth?Nasa says this on possible crash of asteroids.
NASA estimates that the first asteroid, 2016 CZ31, will come by at a speed of approximately 34,560 mph (55,618 km/h) on Friday around 7 p.m. ET (23:00 GMT)
The asteroid, which is roughly as wide as a 40-story skyscraper is tall, is thought to be 400 feet (122 metres) across at its widest point.
The asteroid will pass around 1,740,000 miles (2,800,000 kilometres) from Earth, or more than seven times the typical distance between Earth and the moon, safely avoiding our planet
This space rock periodically makes close encounters to Earth, with the next one scheduled for January 2028, according to NASA.
A second, larger asteroid will pass by Earth on Saturday, albeit it will be farther away.
At its widest visible point, that asteroid, 2013 CU83, is roughly 600 feet (183 metres) across.
It will pass Earth at a distance of 4,320,000 miles (6,960,000 kilometres), or nearly 18 times the typical distance between Earth and the moon.
At 7:37 p.m. ET, this enormous space rock will be approaching the planet at a speed of 13,153 mph (21,168 km/h) (23:37 GMT).
The asteroid 2022 NF(opens in new tab), which passed by Earth on July 7 at a distance of 56,000 miles (90,000 km), or roughly 23% of the average distance between Earth and the moon
Thousands of these near-Earth objects are carefully monitored by NASA and other space agencies
There is a very small chance that an asteroid's orbit could slightly change after coming into contact with the gravity of a larger object, such as a planet
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