Asteroid hit the earth | what happens when a asteroid/comet/meteor hits earth
Channel: skill gained
Date: 21/02/2019

what would happen if a comet similar to 2 km in size collided with the earth. 

it is said that an asteroid of a mere diameter of 2 km is enough to wipe out civilization, and average comets have a diameter of about 10 km.

The earth, much more smaller than other planet So the collision besides releasing a huge amount of energy, could also result in a shift in earth's axis of rotation.

A transfer of such huge momentum might result in a change in the duration of a day
 
Huge Tsunamis if the comet hit the ocean, and an enormous crater wherever it would hit.
 
Huge Tsunamis if the comet hit the ocean, and an enormous crater wherever it would hit.

Depends upon a few factors, such as the size, speed, hit angle and landing point. If it is 10 feet across, it may skip off of the atmosphere or create a pretty fireworks explosion in the sky. If it’s 100 feet across, it may cause a massive explosion, like the one at Tunguska. If its a quarter mile wide, it could take out an entire region, but if its 10km wide, well, that's a game changer for just about anyone and any living thing walking or crawling the Earth. 

That's what we may call an ELE, or Extinction-level Event, and it doesn't really matter where it hits. The deepest point in the oceans is only 11 km deep, and a typical speed for impacting. bolides is around 30 kilometers per second (around 90 times the speed of sound) -could be slower or faster. 

Unlike smaller meteors, an asteroid that size will not be slowed down much by the atmosphere. It will punch through in less than 3 seconds like it's hardly even there. And when it reaches the surface, it will hit so hard that it won't matter if it strikes ocean or land. Most people within a hundred miles or so of the impact point will either drop dead from the concussion of the compression wave of the incoming bolide, or will be completely vaporized. They will most like never know what hit them, but they're the lucky ones…

The energy of the impact will also vaporize a large amount of the Earth's crust, possibly creating a crater more than one hundred kilometers across, throwing all that rock and dirt (known as ‘ejecta') into the air. 

The outrush of air from the impact with cause winds reaching out up to a thousand miles, with wind speeds that may exceed 900 miles per hour. If you are near a coast, and the bolide hits mid-ocean, wave depths near the shore may reach over a mile in height and travel hundreds of miles inland. 

Horrible, unimaginable earthquakes will be felt worldwide, and the sound of the impact will reach out thousands of miles, serving as a warning regarding the real hell that is about to come.

Some of the ejecta will be going so fast that it will fly right out of the Earth's atmosphere and go into orbit around the Earth. But most of it will rain back down on the Earth. - The entire Earth, heating the atmosphere to temperatures possibly near 900 degrees (hot enough to melt lead).

 This heat will last several hours and feel like the inside of an oven. It will trigger forest fires and cook anyone or anything that isn't sheltered deep underground. Your house and even your clothes may likely spontaneously combust. 

You will not survive, but you're probably luckier than the few people who will, because the ugliness is still just beginning…
The combination of dust from the impact, and soot from the forest fires will remain in the Earth's atmosphere for a year or so, blocking the light of the Sun. Without sunlight, much of the Earth's plantlife will die. The entire food chain will collapse.

Many species of animals--including the human race, if we aren't both lucky and resourceful!--will die out, either in the initial catastrophe, or in the ensuing years due to lack of food and the general devastation of the environment.

And if you are fortunate enough to survive all of the above, you and the other survivors, which may number less than 50,000 or even 20,000 of the nearly 7 billion we currently have, will literally be reduced to stone age living for a time. 

You and the other survivors will scrounge just to continue to exist, eating anything that comes your way.

All in all, if you survive such an impact, the next few years of your life won't be your best.