Galaxies, stars and planets

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.

• Introduction
• Learning outcomes
• 1 The Universe today
• 1 The Universe today
• 2 Scale of the Universe
• 2 Scale of the Universe
• 3 Orbits and gravity
• 3 Orbits and gravity
• 4 Our neighbourhood
• 4 Our neighbourhood
• 5 The Sun and stars
• 5 The Sun and stars
• 6 Galaxies
• 6 Galaxies
• 7 'We are stardust'
• 7 'We are stardust'
• End-of-course questions
• Answers to questions
• Comments on activity
• Conclusion
• Acknowledgements