What Time Is It on the Moon? Scientists Consider How Lunar Clocks Could Work

Study the questions and tasks

Work through the material below, or start the interactive practice above to complete an attempt. Try the exercises before opening any answer or transcript sections, then use them to review your work.

Practice level

C1. Try this level if you can follow the instructions and understand most of the language; choose an earlier level if you need more support.

Question formats

Single choice

How to approach this practice

Read the questions, then listen before opening the transcript. Notice names, numbers and any corrections the speaker makes.

1. Question 1 · Single choice

   Choose one answer.

   Who participated in the conversation about lunar timekeeping?

   Return to the passage, recording or visual
   1. James Olthoff and Joel Rose
   2. Two spacecraft engineers
   3. Representatives of several lunar organizations
   4. Scientists from an unnamed observatory
   Check answers and explanations

   Answer

   James Olthoff and Joel Rose

   The recording identifies both the specialist and the journalist involved.

   James Olthoff, a delegate to the International Bureau of Weights and Measures, discussed this issue with NPR’s Joel Rose in a conversation about accurately measuring time on the moon.

2. Question 2 · Single choice

   Choose one answer.

   What does a reliable lunar time system potentially support?

   Return to the passage, recording or visual
   1. The replacement of all Earth-based clocks
   2. Coordination among lunar instruments, spacecraft, and people
   3. The prediction of lunar weather patterns
   4. Direct communication without any shared standards
   Check answers and explanations

   Answer

   Coordination among lunar instruments, spacecraft, and people

   It could coordinate instruments, spacecraft, and people operating in lunar environments.

   A reliable time system could support coordination among instruments, spacecraft, and people operating in lunar surroundings.

3. Question 3 · Single choice

   Choose one answer.

   What problem could inconsistent clocks create for scientific work?

   Return to the passage, recording or visual
   1. They could make observations difficult to compare
   2. They could prevent instruments from collecting data
   3. They could cause spacecraft to remain permanently stationary
   4. They could eliminate the usefulness of navigation systems
   Check answers and explanations

   Answer

   They could make observations difficult to compare

   Different clocks could complicate comparing observations made by separate systems.

   Without agreed standards, even small differences between clocks could complicate planning, navigation, communication, or the comparison of scientific observations.

4. Question 4 · Single choice

   Choose one answer.

   What must a lunar time standard be practical for?

   Return to the passage, recording or visual
   1. Only people working directly on the moon
   2. The systems that rely on the standard
   3. A single international measurement agency
   4. Existing clocks used exclusively on Earth
   Check answers and explanations

   Answer

   The systems that rely on the standard

   The standard must remain usable by the systems that depend on it.

   A time standard must be precise enough for technical work while remaining practical for the systems that use it.

5. Question 5 · Single choice

   Choose one answer.

   Why does the recording emphasize clear information exchange?

   Return to the passage, recording or visual
   1. Because all lunar equipment will be identical
   2. Because participants may operate with different equipment and environments
   3. Because lunar communication will not require coordination
   4. Because immediate surroundings determine the length of a day
   Check answers and explanations

   Answer

   Because participants may operate with different equipment and environments

   Participants may use different equipment and operate in different immediate environments.

   It must also allow information to be exchanged clearly among participants who may not share the same equipment or immediate surroundings.

6. Question 6 · Single choice

   Choose one answer.

   What does the discussion draw attention to?

   Return to the passage, recording or visual
   1. The financial cost of lunar transportation
   2. The hidden importance of timekeeping for exploration
   3. The history of international measurement agencies
   4. The limitations of scientific observation on Earth
   Check answers and explanations

   Answer

   The hidden importance of timekeeping for exploration

   It highlights timekeeping as an often-unnoticed basis for exploration.

   Olthoff’s conversation with Rose draws attention to this often-unnoticed foundation of exploration.

7. Question 7 · Single choice

   Choose one answer.

   What result is presented as necessary before lunar activities can run smoothly?

   Return to the passage, recording or visual
   1. A trustworthy answer about the current time
   2. A permanent settlement on the lunar surface
   3. A new method for transporting equipment
   4. A complete replacement for Earth-based standards
   Check answers and explanations

   Answer

   A trustworthy answer about the current time

   People and systems need a trustworthy, precise understanding of the present moment.

   Before activities on the moon can be coordinated smoothly, the people and systems involved need a trustworthy answer to a deceptively simple question: when, exactly, is now?

What to review next

Listen again to difficult sections, then open the transcript to check what you heard. Repeat a useful phrase aloud and try the recording once more without the text.

A focused practice result shows how you did on these tasks. Use several activities across skills to decide what to study next; one practice score does not certify an overall CEFR level.

Before you practise: a worked example

Listen for the final information, especially when a speaker corrects or changes an earlier statement.

Example transcript: “Let’s meet at five — actually, half past five would be better.” What is the final suggested time?

The final suggested time is 5:30. Actually signals a correction; the first time is replaced by the later suggestion.

This teaching example is separate from the scored questions. After your test, compare any mistakes with the explanation and revisit the topic before trying again.