An introduction to exoplanets
An introduction to exoplanets

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

An introduction to exoplanets

2.1  Sizes of the Solar System planets

Activity 1 will help you to visualise the relative sizes of the planets in our Solar System.

Activity 1  DIY edible Solar System

Timing: Allow about 10 minutes, plus time for shopping (and eating)

You need:

  • 1 watermelon or similar large melon
  • 1 large grapefruit
  • 1 dessert apple
  • 1 lime
  • 2 gooseberries
  • 1 blueberry
  • 1 white/red/black currant (or peppercorn).

You can substitute any of these for fruit/vegetables of a similar size.

Using information from the internet, try to match each piece of fruit with the correct planet. (Hint: which is the largest planet? Which two planets are almost identical in size?)

When you think you’ve got it right you can check your answer here:

Answer

A fruit salad Solar System showing the approximate relative sizes of the planets
Figure 2  A fruit salad Solar System showing the approximate relative sizes of the planets
EXO_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 50 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, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 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 prospectus371