astronomer – n. a scientist who studies stars and planets

particular – adj. used to describe a certain part of something

evolution – n. a gradual process of change and development

unstable – adj. likely to change or end suddenly

fate – n. what happens to something, especially something bad

befall – v. to happen

clue – n. a piece of information that helps you solve a problem or answer a questions

resolve – v. to solve or end a problem or difficulty