Subject 28 · Space & Stars Physics
Chapter 28
Space & Stars Physics
Start with the Solar System's clockwork, then follow stellar birth and death, the HR diagram, cosmic distance, redshift, the Big Bang, and orbital calculus.
Build space & stars physics one idea at a time.
Start with the foundations, then explore advanced ideas and calculus at the depth your course needs.
6 of 6 lessons
The Earth & the Solar System
Explain days, seasons, Moon phases, planets, comets, and orbital motion.
Star Birth & Life Cycles
Follow a nebula through the main sequence to white dwarf, neutron star, or black hole.
The Hertzsprung–Russell Diagram
Place stars by luminosity and temperature and interpret their evolution.
Measuring the Universe
Use parallax, standard candles, and inverse-square reasoning.
Redshift & the Big Bang
Connect stretched wavelengths, Hubble's law, and the cosmic background.
Astrophysics Calculus
Derive Kepler from Newton and connect escape velocity with black holes.
Change one variable. Watch the physics respond.
Explore v = √(GM/r), then take the idea into the full lessons.
Set an orbital speed
Closer orbits and more massive central bodies require higher orbital speed.
Everything around the chapter, in one place.
Keep building with practice, classroom presentations, formulae, and a game that puts these ideas to work.
Exam practice
Questions, guided reasoning, and exam-style problem solving.
Browse exam questions →Formula toolkit
Keep the key relationships and their units close to hand.
Review formulae →Members · Classroom presentationClassroom slides
Reveal lesson ideas, examples, and checks in full-screen classroom mode.
Open slides →Lesson files
Find downloadable teaching resources and worksheets in the library.
View files →Star Forge
L ∝ M³·⁵. Choose a stellar mass and watch the star travel across a real HR diagram to its ending.
Play the free chapter game →See it. Read it. Work it.
Connect diagrams to physical relationships and exam reasoning.
Explore diagrams →Guided support
Ask for a hint, check your reasoning, or explore a similar problem.
Ask GioAI →Key ideas to remember
Move without losing your place.
Extra challenging questions
Take the ideas further with course-specific extension questions, supplied-data graphs and worked solutions.