"Half-Baked Asteroids Have Earth-Like Crust"

I read, "Half-Baked Asteroids Have Earth-Like Crust" and decided to write about it. The final sentence of the opening paragraph truly sums up the article. It states, "But two newly discovered meteorites may rewrite the book on how some asteroids form and evolve." Write off the bat, I was intrigued and looked forward to learning more about these meteorites. Researchers state that these meteorites are ancient asteroid fragments consisting of feldspar-rich rock called andesite. The cool thing about these samples is that we as humans have only seen these rocks on earth. This means that these rocks were the first of their kind from a different location in our solar system. At first, many researchers thought that this meteorite could have been part of the moon. However, that theory was ruled out quickly. Finally the researchers came up with a theory that this meteorite is about 4.5 billion years old, about how old the solar system is. The researchers then hypothesized that the asteroid was 100 kilometers in diameter, a very large asteroid. "Our work illustrates that the formation of planet-like andesite crust has occurred by processes other than plate tectonics on solar system bodies," says Day. This is a huge step to finding out how the earth formed because it may not be only because of plate tectonics. This article expresses that the earth could have formed in a completely different way than humans originally had thought.