Reference Material:
One of the most amazing things in the speaker’s life is studying cosmology. Studying cosmology is the most amazing thing for the speaker because the universe is mysterious. Scientists previously believed the big bang happened 10 to 20 billion years ago. However, a more precise measurement indicates the universe is 13.8 billion years old (instead of 14). (And has kept changing ever since.) Which is perfectly matched the university is little older than the oldest star (which has 13 billion years old), the Big Bang theory. Even when the universe begins is known) People still need to understand how the big bang happened and how the universe works. And know about the future.
Sample Answer:
People believed the Big Bang happened 10 to 20 billion years ago. However, by more precise measurement of particles, it has been proved that it actually happened 13.8 billion years ago, which fits well that the universe is older than the oldest star. After the Big Bang, the universe keeps continuous changing. People still need to understand how the Big Bang happened even though the origin is known. (68 words)
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