The Day the Earth Stood Still (2008) - 3 questions

Question: Was it just me or did the Earth not stand still in this film at all? And also can you explain the film's events to me.

Answer: No, it sure didn't. It's just a figure of speech referring to everyone's attention being focused on the alien sphere. In the opening of the film, a man's genetic material is harvested in order to grow a body for a member of an alien race to inhabit. Many years later, this alien individual comes to Earth to warn the population that their violent nature has marked them for termination now that they have developed space travel and their violence poses a threat to the rest of the universe. They must stop immediately to avoid this fate. The alien ambassador is attacked before he can deliver this message, rather proving the point he came to make. His robotic guardian is provoked to the point of initiating the extinction sequence, and a small group of humans sets out to prove to him that the human race is worth saving before it is too late.

Question: When Klaatu and Professor Barnhardt are writing on the black board together, are they solving something that we just haven't solved yet, and so answering this question is hopeless, or does anybody know what it is they are supposedly solving, it looks to be something to do with an event horizon.

Answer: As in the original 1951 movie, Professor Barnhardt has an equation on the board that suggests (theorizes) that space travel through inter-dimensional universes is possible. Klaatu solves the mathematical equation thereby proving that, not only is it possible, but that's how he got there. This was brought out in the original movie.

Question: Exactly what Bach music plays at Professor Barnhardt's that Klaatu seems to be impressed so much by? And, what Latin phrase is shown hanging from the wall in his (Nobel?) prize plaque?

Answer: The Latin phrase on the Nobel prize: "Inventas Vitam Juvat Excoluisse Per Artes" means "Let us improve life through science and art"