I had already written an article on AUM from a scientific perspective, mapping AUM to Universe through particle physics and states of matter. This article is about Gayatri Mantra.
Gayatri Mantra is held next to AUM in most hindu scriptures. It is one mantra that is common to many sects of Hinduism. All seers and saints of various sects of hinduism and scriptures of various hues talk very high of Gayatri Mantra, though they interpret it differently.