Boundary by Eric Flint & Ryk E. Spore

This was quite fun, though there were a few info dump paragraphs. This was an Aliens Visited our Solar System, (so lets send a space ship to Mars to look at the base our sensors found) story. Entertaining enough, and the characters were fun too, though too many of the women were beautiful. The engineers were happy to use low tech solutions when they were most appropriate, to the horror of the IT people, whose motto was always newer is better.