What would be the effect(s) of this asteroid?

"At this very moment we face a threat insurmountable to Man. We are faced with two options. Stay on Earth and die, or leave Earth to space." - UN Preservation Council, CE 2047

Earth, year CE 2047

An asteroid is detected, traveling at about 5% Lightspeed, with a mass of about 1/2 the Moon. It also has a trail of asteroids with it, the average size being 3 times the mass of Apophis.

The asteroids are on a direct course with Earth, and will impact in 4 months. Humanity prepares for the impact, evacuating to space and satellites around the planet and on Luna.

4 months later, January 2048, it happens

The asteroid impacts just off of the coast of Africa, about 30 miles into the ocean. The main asteroid impacts first, with the trail of the smaller ones impacting within 3 hours.

My question is this: What would the effect be on the planet? How would the landscape change, and what are the chances of everything being destroyed? That being said, how long would it take for the surface to become habitable again?

--Note--

• The main asteroid has a mass of 1/2 the moon's
• The asteroid trail's average mass is 3 times the mass of Apophis
• The asteroids are moving at 5% of lightspeed

posted almost 5 years ago

Hunt Castle‭

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