The Sun feels unique because it is ours, but it is a fairly ordinary star, one of billions. It shines not by burning but by fusing hydrogen into helium deep in its core, flooding the Solar System with energy.
The Sun is a medium-sized star made mostly of hydrogen and helium. It releases energy by the nuclear fusion of hydrogen into helium in its core, and it is the main source of energy for the Solar System.
The Sun is a star, a medium-sized star made mostly of hydrogen and helium. It releases energy by the nuclear fusion of hydrogen into helium.
The Sun is the main source of energy for the Solar System, and just one of billions of stars.
See the Sun as a star powered by fusion in its core.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
The Sun is best described as...
The Sun is made mostly of...
The Sun releases its energy by...
In the Sun, hydrogen is fused into...
The Sun is medium-sized, made of light elements, and shines by fusion.
The Sun shines by nuclear fusion, joining hydrogen nuclei into helium, not by burning like a fire. It is a fairly ordinary, medium-sized star among billions of others.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
Compared with other stars, the Sun is...
The energy radiated by the Sun comes from...
For the Solar System, the Sun is the...
The Sun as a star is mapped. Keep the chain going.