Please please help me Why did Asteroid 2019 OK cause concern among scientists? *

a)The asteroid was not detected until it was extremely close to Earth.

b)It’s the largest known near-Earth asteroid ever discovered.

c)The asteroid’s path was aimed directly at the moon.

d)The asteroid was too large to be deflected away from Earth
asap i need help

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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