Moons
Moons

This free course is available to start right now. Review the full course description and key learning outcomes and create an account and enrol if you want a free statement of participation.

Free course

Moons

3.3.1 The groovy moon

Figure 42 Left: Phobos (nearer and larger) and Deimos (smaller and further away) seen from the surface of Mars. Right: our own Moon, as it would appear in the martian sky if it were at the same distance from Mars as it is from Earth.

Test your understanding of John Murray’s explanation for the origin of the grooves on Phobos as explained in the video. Which of the explanations below did he suggest as the cause of the grooves on Phobos?

  • fractures associated with the impact onto Phobos that caused the crater Stickney
  • Phobos passing through a hail of ejecta thrown out by an impact on Mars
  • gases escaping from the interior of Phobos
  • fractures caused by the distortion of Phobos caused by Mars’ gravity.

Find out the answer to this question in the next step, and watch a short video of Phobos and Deimos shot from the surface of Mars.

MOONS_1

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has over 40 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to university level study, find out more about the types of qualifications we offer, including our entry level Access courses and Certificates.

Not ready for University study then browse over 900 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus