The Idea of a Space Elevator

 PART 4 – Gapped Text (Questions 16–20)

Read the article about space elevator technology.

Five sentences have been removed from the text.

Choose from the sentences A–F the one which fits each gap (16–20).

There is one extra sentence which you do not need to use.

The Idea of a Space Elevator

For many years, rockets have been the only way to transport equipment and people into space. However, engineers and scientists have explored alternative technologies that might make space travel cheaper and safer in the future.

16 ______

The basic concept involves building an extremely long cable stretching from the Earth’s surface to a satellite positioned high above the planet in orbit. This cable would act like a track along which special vehicles could travel.

17 ______

These vehicles would move slowly along the cable, carrying supplies, satellites or even astronauts into space. Instead of using explosive rocket fuel, the vehicles could be powered by electromagnetic systems or solar energy.

Although the idea sounds simple, engineers face several important technical challenges.

18 ______

The cable would need to be incredibly strong and lightweight in order to support not only the weight of the vehicles but also its own enormous length. At present, scientists are researching new materials such as advanced carbon structures that might provide the necessary strength.

Energy supply is another challenge.

19 ______

Some engineers believe electricity could be transmitted wirelessly to the vehicles as they travel upward. Others suggest solar panels could generate power during the journey.

Despite these challenges, many experts believe the concept could transform the future of space travel.

20 ______

If successful, the system could allow regular transport of equipment into orbit while reducing the environmental impact of rocket launches.

 

Sentences:

A These lift vehicles are sometimes called “climbers” because they climb the cable toward space.

B One idea that has attracted attention is the concept of a space elevator.

C Engineers must also find an efficient way to power the lift vehicles.

D Scientists are currently investigating materials strong enough for the cable.

E The system might dramatically reduce the cost of launching objects into orbit.

F Rockets will probably remain the only transport method for the next century.