Alliteration: Alliteration is a special case of consonance and refers to the repetition of consonant sounds or blends at the beginning of words or in the stressed syllables of a line. Since consonance may happen anywhere in a word, the concepts are related but not identical.
How Old is the Solar System? How old is the Solar System? That is a question that cuts to the heart of it all. By studying several things, mostly meteorites, and using radioactive dating techniques, specifically looking at daughter isotopes, scientists have determined that the Solar System is 4.6 billion years old.
The nebular hypothesis maintains that the Solar System formed from the gravitational collapse of a fragment of a giant molecular cloud. The cloud itself had a size of about 20 parsec (65 light years), while the fragments were roughly 1 parsec (three and a quarter light-years) across.