What is the maximum heat faced by meteorites entering the earth?

Question

I'm doing a project on Panspermia and I need graphical evidence to support an anti-Panspermia theory. I intend to do this by making a graph showing the maximum heat and archaebacteria can survive in, maximum radiation it can survive in and comparing that to heat a meteor faces when entering the earth's atmosphere and the maximum possible radiation the meteor could have faced during its trek through our solar system. So there's basically 4 things i need to know.
Type of archaebacteria and max heat possible
Type of archaebacteria max radiation survival
Meteor entering earth and max heat faced
Radiation levels in space.

An answer to the above 4 questions or even if you only answer 1 would be really helpful. If you could cite your source it would be even better. Thanks.

Answer 1

Hi. The interior of a body entering the Earth's atmosphere would not get hot at all. Most meteorites that have been found shortly after reaching the surface are only warm to the touch. The exterior gets ablated away and any spores in the ablated material would see high temperatures. Maybe 2,000 F. (Most folks assume the heat is caused by friction, bit this is only partly true. The major source of heat is atmospheric compression, the same as that found in a diesel engine.)