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Grade 12 Science · Problem type
Where the atoms were made
Use this for “Which two elements are the most common in the universe, and where were they made?”
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Where were most of these atoms made?
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Assumptions
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Hydrogen and helium are most of the Sun and the solar system.
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Stars fuse elements up to iron; heavier ones need a supernova or a neutron-star merger.
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The life of a massive star
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The Milky Way, galaxies, the Big Bang and the expanding universe
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Related lessons
The sun and stellar evolution: fusion, the H-R diagram, nucleosynthesis and black holes
Main lesson
How much mass the Sun turns into light
Use this for “The Sun gives off 3.828 × 10²⁶ W. How much mass does it turn into energy each second?”
A star’s mass sets its life
Use this for “A star has twice the Sun’s mass. How bright is it, and how long will it last?”
The life of a Sun-like star
Use this for “Put the stages of a Sun-like star’s life in order. What is left at the end?”
The life of a massive star
Use this for “What is left after a massive star explodes as a supernova?”