Domain IX covers the Solar System and the Universe (6% of the TExES Science 7-12 (236) exam) across all 4 official competencies: Earth's placement and orientation in the solar system, the Sun and orbiting bodies, the composition and history of the universe, and the history and methods of astronomy.

Finally get a straight answer on why seasons happen (hint: it's not distance from the Sun), what actually separates a light-year from an astronomical unit, and how a star's mass determines whether it fades quietly or ends in a supernova.

What's inside:

• All 4 official competencies (042–045)

• Plain-English breakdowns and analogies

• Common Mistake to Avoid call-outs

• Practice questions with full answer rationale