Listen & Learn: Dark Energy

Ngày đăng : 16.11.2021 23:11

Pre-listening vocabulary

force: something that can affect the movement of an object
expand: to grow larger
gravity: a force that causes all objects to be attracted to each other
astronomer: a scientist who studies space
conclusion: a belief that is formed after making observations
accelerate: to begin to move faster

Listening English:

Gapfill exercise

Dark energy is a ........force that exists throughout the universe. It is believed to make up about 68% of everything that exists, and it affects the way the universe is expanding. ........have known about the expansion of the universe since 1929. But for many years, most believed that the force of gravity would eventually slow down this expansion. However, in the 1990s, a team of astronomers ........that the universe was actually expanding ........than it had been years before. They came to the conclusion that there was another force, called dark energy, that was causing the expansion to accelerate. Dark energy is even ........than gravity, and scientists still don’t know much about it. It has often been called the universe’s greatest mystery.

Transcript

Dark energy is a mysterious force that exists throughout the universe. It is believed to make up about 68% of everything that exists, and it affects the way the universe is expanding. Scientists have known about the expansion of the universe since 1929. But for many years, most believed that the force of gravity would eventually slow down this expansion. However, in the 1990s, a team of astronomers observed that the universe was actually expanding faster than it had been years before. They came to the conclusion that there was another force, called dark energy, that was causing the expansion to accelerate. Dark energy is even stronger than gravity, and scientists still don’t know much about it. It has often been called the universe’s greatest mystery.