Question

2 multiple choice 2 points
base your answers to the following questions on the passage below and on your knowledge of earth science.
cosmic microwave background radiation
in the 1920s, edwin hubbles discovery of a pattern in the red shift of light from galaxies moving away from earth led to the theory of an expanding universe. this expansion implies that the universe was smaller, denser, and hotter in the past. in the 1940s, scientists predicted that heat (identified as cosmic microwave background radiation) left over from the big bang would fill the universe. in the 1960s, satellite probes found that cosmic microwave background radiation fills the universe uniformly in every direction, and indicated a temperature of about 3 kelvins (k). this radiation has been cooling as the universe has been expanding.
scientists infer that the universe began approximately
1.0 billion years ago
3.3 billion years ago
8.2 billion years ago
13.7 billion years ago
3 multiple choice 2 points
scientists who proposed the big bang theory were attempting to explain
the origin of the universe
why stars have different luminosities
the formation of our solar system
how earths atmosphere evolved

Explanation:

• For question 2: According to scientific consensus, the universe began approximately 13.7 billion years ago. This is a well - established fact in cosmology.
• For question 3: The Big Bang Theory is a scientific theory that aims to explain the origin of the universe. It describes the early expansion and evolution of the universe from a very hot, dense state.

Answer:

1. 13.7 billion years ago
2. the origin of the universe