News Report 1

US scientists have announced the discovery of gravitational waves, which are tiny waves produced by massive objects moving very quickly. Two black holes produced the waves when they crashed into each other about 1.3 billion years ago. A black hole is a place in space where the gravity is so strong that even light cannot escape. This announcement of the discovery comes a century after Albert Einstein first predicted gravitational waves would exist.

The discovery was made possible by using a highly sensitive instrument designed to detect signals of gravitational waves and identify their sources. This discovery proves that there are gravitational waves, and strongly confirms the existence of black holes.

With this discovery, scientists are given a new tool to study and understand the universe. The waves could help scientists learn more about what happened immediately after the universe began and how the universe expanded. Scientists hope that they may be able to observe parts of the universe that were previously undetectable.

1. What discovery have US scientists made?

2. What features do black holes have according to the news report?

3. Why is the discovery important? 

（Visit the website given in Before Listening to know more about the gravitational wave.）

Answers

News report

1 Listen to a news report and choose the best answer to the questions you hear.

  1 (a)  2 (c)  3 (b)