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http://en.wikipedia.org/wiki/1972_Great_Daylight_Fireball http://web.archive.org/web/20040903124820/http://www.maa.agleia.de/Comet/Other/1972.html
http://www.discovery-enterprise.com/2012/08/the-great-day-time-fireball-of-1972.html
http://photojournal.jpl.nasa.gov/jpeg/PIA06258.jpg
http://www.ctbto.org/uploads/tx_ctbtoslider/755px-Sedan_Plowshare_Crater.jpg
What would the impact crater look like in 1 million years if the object collided with the Moon?
I believe that if this fireball had collided with the moon it would have caused more damage than if it hit earth because the lack of atmosphere on the moon would not decrease the size of the object due to the atmosphere.
Why would the results be different?
If a planet does not have much of an atmosphere it probably would have damage done to it compared to a strong atmosphere that does not go down without a fight against an object.
How close did it come from the Earth's surface?
The Fireball only came within 53 kilometers of Earth's surface.
What would happen if your object with Earth?collided
There would be much damage done to the landscape of the earth. It had the explosive force of 5 Hiroshima bombs. One Hiroshima bomb killed at least 100,000 people. Can you imagine that times 5 as many casualties. It probably would have totally made the of Northwest coast of North America extinct.
Why do you think so? What evidence do you have that this would happen?
There are many scientist who have the proof that the fireball had the explosiveness of 5 Hiroshima bombs.
What would the impact crater look like 1 million years from now?
It would probably be very small if it did not have so much explosiveness but since it had so much of that force it would probably be about 50 meters wide. Since it would have happened recently it probably would still have a good resemblance about what it had looked like in the 70’s. It also would probably be very deep do to its explosiveness.
Depending on what it's composition was, it could have been 3 meters in diameter if it was carbonaceous chondrite. If it was cometary ices it may have been 14 meters in diameter. Around the same size as a small truck .
What crater would look like on Earth.
Citations of Sources
It was made of cometary ices or carbonaceous chondrite ( we don’t know exactly).
The meteors 100-second passage through the atmosphere reduced its velocity by about 800 metres per second (2,600 ft/s) and the whole encounter significantly changed its orbital inclination from 15 degrees to 8 degrees.
What crater might look like on the moon
photo credit Nasa / Goddard Space Flight Center / Reto Stöckli