I asked an online AI to describe 3 kilometer asteroid striking the Earth, in five second intervals:
View attachment 1811831
T = 0 seconds
Initial Impact with Atmosphere: The asteroid begins to enter the Earth's atmosphere. The immense kinetic energy (due to its speed and mass) starts converting into heat and light as it compresses the air in front of it. The surrounding air temperature rises rapidly, leading to a glowing plasma around the asteroid.
T = 5 seconds
Atmospheric Entry: The asteroid has traveled approximately 50 km into the atmosphere. The friction between the asteroid and the air is causing the surface to heat up to several thousand degrees Celsius. The brightness of the fireball would be visible over a large portion of the Earth, rivaling the Sun. Shockwaves begin to propagate outwards in all directions.
T = 10 seconds
Fireball Expansion: The asteroid has descended further, perhaps 80-100 km into the atmosphere. The surrounding air is vaporizing due to the extreme heat. The shockwave around the asteroid becomes increasingly violent, and the asteroid might start to fragment, depending on its composition. The fireball is growing in size, and the energy released starts to have serious atmospheric effects, including sonic booms that can be heard thousands of kilometers away.
T = 15 seconds
Shockwave Amplification: By now, the asteroid could be around 120 km deep into the atmosphere. The fragmentation of the asteroid continues if it hasn’t fully vaporized. Each fragment creates its own fireball and shockwave, amplifying the destructive potential. The heat and shockwave start reaching the surface, causing widespread destruction even before the impact. The atmospheric pressure wave generated is on the scale of a global catastrophe.
T = 20 seconds
Near Surface Impact: The asteroid is now less than 50 km above the Earth's surface. The air displacement and heat are so intense that they can ignite forests and start massive fires across vast areas. The shockwave is moving at hypersonic speeds and would begin to devastate structures and landscapes directly beneath the asteroid's path.
T = 25 seconds
Impact or Airburst: The asteroid either impacts the surface or explodes in an airburst, depending on its composition and angle of entry. An impact would create a crater potentially hundreds of kilometers wide, vaporizing everything in the vicinity. If an airburst occurs, the explosion would release energy equivalent to billions of tons of TNT, causing immediate, widespread devastation over an area possibly the size of a small country. A shockwave of unprecedented magnitude would propagate outwards, flattening everything in its path for hundreds of kilometers.