Space Physics
The Earth–Moon–Sun system, orbits and the speed formula, the life of a star, and the expanding universe, a short, recently added section that rewards clear cause-and-effect answers.
What this lesson covers
Space Physics is a 8-part O Level Physics lesson. Each part makes one point and then hands over to the next, so it can be read in a sitting or picked up again at the part you stopped on. It defines the idea in plain words before using it, works through an example step by step, breaks the topic into its parts and compares them, shows where it is used outside the textbook, names the mistakes that cost marks in an exam, ends with a recap of what to remember.
How it begins
Earth rotates on its axis once in 24 hours, day and night. It orbits the Sun once in about 365 days. Its axis is tilted at about 23°, so for half the year one hemisphere leans towards the Sun: longer days, higher Sun, more concentrated energy, summer. Not "closer to the Sun"; Earth is in fact nearest in January. The Moon orbits Earth in about a month.
The 8 parts
- The Earth, the Moon and the Sun
- Gravity and orbits
- Stars: how the Sun works and how it will end
- Distances in space, and light-years
- Redshift, Hubble, and the Big Bang
- Where marks go
- What to remember
- Watch one worked through
Practise Space Physics
Everything on QuizByt for O Level Physics that goes with this lesson: read it first, then test yourself while it is fresh.
🧠 5 quizzes on Space Physics (2 easy, 2 medium, 1 hard)
Work up from easy to hard: the hard quiz asks the O Level exam-style questions on Space Physics.
🖨️ Printable worksheet
Space Physics on paper for O Level, with room to write the working out. Preview the first page free.
🎮 Games for O Level Physics
Memory and reasoning games at the right level for O Level. Passing a quiz on Space Physics earns the credits that open them.
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