The Universe and Its Stars
Aligned to HS-ESS1 — Next Generation Science Standards.
What this lesson teaches
The universe began with the Big Bang and has expanded ever since. Stars form, fuse elements, and die, recycling matter into new stars and planets.
Worked example
Our sun fuses hydrogen into helium, releasing energy; when massive stars die, they scatter heavier elements that form planets like Earth.
Practice questions
- What evidence supports the Big Bang?
- How do stars produce energy?
- Where did the heavy elements in Earth come from?
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
El universo y sus estrellas
El universo comenzó con el Big Bang y se ha expandido desde entonces. Las estrellas se forman, fusionan elementos y mueren, reciclando materia en nuevas estrellas y planetas.
Ejemplo: Nuestro sol fusiona hidrógeno en helio y libera energía; cuando las estrellas masivas mueren, dispersan elementos más pesados que forman planetas como la Tierra.
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