Is There Anybody Out There Reading Answers: IELTS Reading Practice Test

This passage examines humanity's ongoing effort to detect signs of intelligent life beyond Earth. It traces the history of SETI, covering early theoretical work, radio telescope programmes, debates about the right frequency to monitor, the 1977 Wow! signal, and the rise of computing-powered searches.

Cambridge source: Cambridge IELTS 9, Academic Test 4, Passage 2.

You should spend about 20 minutes on Questions 1–13, which are based on the passage below.

The passage contains two question types:

• True/False/Not Given: Questions 1–7
• Matching Paragraph Headings: Questions 8–13

Paragraph A 

The idea that we might one day make contact with an alien civilisation is not new. For centuries, philosophers and scientists have speculated about the existence of life on other worlds. In the twentieth century, however, the question moved from the realm of philosophy into that of science. The invention of radio technology meant that, for the first time, it was physically possible to send and receive signals across the vast distances of space.

Paragraph B 

The first serious scientific attempt to detect signals from extraterrestrial civilisations was Project Ozma, launched in 1960 by astronomer Frank Drake at the National Radio Astronomy Observatory in Green Bank, West Virginia. Drake pointed a large radio telescope at two nearby stars, Tau Ceti and Epsilon Eridani, and listened for any unusual signals. The project ran for several months but detected nothing conclusive. Despite this, Drake remained confident that intelligent life existed elsewhere in the universe, and he later devised what became known as the Drake Equation, a formula designed to estimate the number of communicating civilisations in our galaxy.

Paragraph C 

Drake's equation took into account a number of factors: the rate of star formation in the galaxy, the proportion of stars with planetary systems, the fraction of planets that could support life, the fraction on which life actually develops, the fraction on which intelligent life evolves, the fraction of those civilisations that develop technology capable of sending detectable signals, and finally the length of time such civilisations survive and continue to transmit. When Drake first presented his equation at a conference in 1961, the estimates for each variable were largely uncertain. Even today, while astronomers have improved estimates for some variables, particularly the rate of star formation and the proportion of stars with planets, the biological and sociological factors remain deeply contested.

Paragraph D 

One major problem with searching for extraterrestrial intelligence is the sheer size of the universe. Even the nearest star to our sun, Proxima Centauri, is so distant that a radio signal travelling at the speed of light would take over four years to reach it. If a civilisation existed on a planet orbiting a star hundreds or thousands of light years away, any exchange of messages would take centuries or millennia. This makes two-way communication, of the kind imagined in science fiction, essentially impractical within a human lifetime.

Paragraph E 

Another difficulty is deciding which radio frequency to use when listening for alien signals. The electromagnetic spectrum contains an enormous number of possible frequencies. However, most SETI researchers have focused on a narrow band around 1420 megahertz, the frequency at which neutral hydrogen, the most common element in the universe, emits radiation. The reasoning is that any technologically advanced civilisation would know about hydrogen and might choose this frequency as a universal meeting point. This approach is not without critics. Some scientists argue that focusing on a single frequency band is too restrictive and that signals could arrive at any frequency, or indeed by means entirely different from radio waves.

Paragraph F 

The most famous moment in SETI history occurred on 15 August 1977, when astronomer Jerry Ehman, working at the Big Ear radio telescope at Ohio State University, detected a signal so striking that he circled it on the printout and wrote "Wow!" in the margin. The signal, now known simply as the Wow! signal, lasted 72 seconds and matched almost exactly the profile that SETI researchers had predicted an extraterrestrial signal might have. Despite decades of subsequent observation, the signal has never been detected again, and its origin remains unexplained.

Paragraph G 

Since the 1990s, the search has been transformed by computing power. The SETI@home project, launched by the University of California, Berkeley in 1999, allowed millions of ordinary computer users to donate their unused processing power to analyse radio telescope data. At its peak, SETI@home was one of the largest distributed computing projects in history. The project was put into hibernation in 2020, but the data it generated continues to be analysed. More recently, the Breakthrough Listen initiative, funded by Russian-Israeli entrepreneur Yuri Milner, has injected substantial new resources into the search, using some of the world's most powerful telescopes to survey the nearest million stars.

Paragraph H 

Despite decades of effort and no confirmed detection of an alien signal, many scientists remain optimistic. They argue that we have so far surveyed only a tiny fraction of the stars in our galaxy, and that the absence of a signal so far does not mean the absence of a civilisation. Others are less hopeful. The Fermi Paradox, named after physicist Enrico Fermi, who reportedly asked "Where is everybody?", points out that, given the age and size of the galaxy, if intelligent civilisations were at all common, we should by now have heard from them, or even been visited. The fact that we have not is, for some, strong evidence that we are alone.

Is There Anybody Out There : True/False/Not Given Questions (1–7)

Do the following statements agree with the information given in the Reading Passage? In boxes 1–7 on your answer sheet, write: TRUE if the statement agrees with the information FALSE if the statement contradicts the information NOT GIVEN if there is no information on this

1. Before the twentieth century, the possibility of life on other worlds was discussed only in a non-scientific context.

2. Project Ozma was the first attempt to send radio signals to stars beyond our solar system.

3. Frank Drake devised an equation to calculate how many civilisations in our galaxy might be detectable.

4. Most scientists who attended the 1961 conference agreed on the values to assign to the biological variables in Drake's Equation.

5. All SETI researchers agree that the frequency of 1420 megahertz is the best frequency to monitor.

6. The Wow! signal has not been detected a second time since 1977.

7. The SETI@home project used more computing power than any other distributed computing project ever launched.

Is There Anybody Out There: Matching Paragraph Headings Questions (8–13)

The Reading Passage has eight paragraphs, A–H. Choose the correct heading for paragraphs B, C, D, F, G, and H from the list of headings below. Write the correct number, i–x, in boxes 8–13 on your answer sheet.

List of Headings:

• i. The challenge of distance in interstellar communication
• ii. A moment of excitement that remains a mystery
• iii. How computing transformed the scale of the search
• iv. The first practical attempt to listen for alien signals
• v. Estimating the likelihood of detectable civilisations
• vi. Disagreements about the right frequency to monitor
• vii. Evidence that we may be the only intelligent species
• viii. Ongoing optimism despite a lack of confirmed results
• ix. Early philosophical speculation about alien life
• x. The role of private funding in modern SETI

8. Paragraph F 9. Paragraph C 10. Paragraph B 11. Paragraph G 12. Paragraph D 13. Paragraph H