Physics · KS3 Y9 · Space & Gravity
The Sun is a star
The Sun is a starFree5:01Heddy Score 3 of 7, below the standard
What you need to know
- The Sun is a star; it looks different from night-sky stars only because it is so much closer.
- Most stars are small, dim red dwarfs, so the Sun is actually larger and brighter than most stars.
- In the Sun's core, hydrogen nuclei fuse to form helium, and a little mass is turned into a huge amount of energy.
- Energy is carried outward by convection, and the light we see comes from the thin photosphere; the very hot, faint corona lies above it.
In this clip
Runs 5:01, from 0:03 to 5:04 of the full video.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · passed. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works2.81M views · 32.9K likes · CrashCourse 17.3M subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
Opens with exactly the idea that the Sun is a star, then shows what powers it and how its energy reaches us.
CrashCourse on YouTubechecked 2026-10-22
Plays from youtube-nocookie.com. No YouTube cookies until you press play.