Big Bang Theory

2. The universe is mostly made up of _____ and Helium.
4. ____ began suddenly with a great expansion 13.7 billion years ago.
5. Belgian cosmologist and Catholic priest
9. The first _____ formed at 300,000 years.
11. The dark black lines, called _______, represent the chemical elements in a star which are used for identification, like a fingerprint.
12. First person to use the term "Big Bang"

1. The universe must have began as one singular particle, the _____.
3. The first _____ formed at 1 billion years.
6. The big bang theory states that the Universe is _____.
7. leftover radiation from the Big Bang.
8. ______ General Theory of Relativity led scientists to think the universe was static (lacking movement).
10. Edwin Hubble discovered the property known as _____.