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.
Why is the Earth younger than the moon and meteorites?: Current estimages of the age of the Solar System are 4.5 billion years, but the oldest rocks on the Earth are only 3.6 billion years old. This is younger than the oldest rocks from other solar system objects, why? Earth is geologically active. Earth has a hot, molten interior.