Free course

Galaxies, stars and planets

Free statement of participation on completion

This free course, Galaxies, stars and planets, is a general introduction, including scale of the universe from the very large to the very small; orbits and gravity; the Solar System; the Sun and other stars; galaxies and the composition of astronomical objects.

Course learning outcomes

After studying this course, you should be able to:

  • understand the scale of items within the Universe
  • appreciate the wide variety of objects contained in the Universe
  • understand the relative sizes of the planets within the Solar System
  • calculate how long it takes for light to reach the Earth from the Sun.

You can start this course right now without signing-up. Click on any of the course content sections below to start at any point in this course.
If you want to be able to track your progress, earn a free Statement of Participation, and access all course quizzes and activities, sign-up.

Course content