# Astronomy (ASTR) courses

Santiago Canyon College · 2025-2026 Catalog · 4 courses

Source: https://sccollege.elumenapp.com/catalog/catalog/courses

"Offered" lists sections in this catalog year's class schedules: Summer 2026.

### ASTR 100L — Astronomy Laboratory

- **Units:** 1
- **Hours:** 54 contact hours total
- **Prerequisite:** ASTR 102 (Introduction to Stars and Galaxies) or concurrent enrollment or ASTR 103 (Introduction to the Solar System) or concurrent enrollment or ASTR 104 (Introduction to Cosmology) or concurrent enrollment
- **Transfers to:** CSU, UC
- **Offered:** not on the Summer 2026 schedule
- Previous title: Astronomy 140, Astronomy Laboratory (2017)

Explores techniques used to study properties of celestial objects and astronomical phenomena. Field trips to local planetaria and/or dark sky locations may be included.

### ASTR 102 — Introduction to Stars and Galaxies

- **Units:** 3
- **Hours:** 54 contact hours total
- **Transfers to:** CSU, UC
- **Offered:** Summer 2026, 1 section (/c/santiago-canyon-college/schedule/summer-2026/astr.md)

Surveys the development of astronomy, current research and observations of stars, galaxies and large-scaled structures in the universe. Explores light and gravity to understand the properties and evolution of stars, neutron stars, black holes, galaxies and the universe structures and changes.

### ASTR 103 — Introduction to the Solar System

- **Units:** 3
- **Hours:** 54 contact hours total
- **Transfers to:** CSU, UC
- **Offered:** Summer 2026, 1 section (/c/santiago-canyon-college/schedule/summer-2026/astr.md)

Surveys the history of astronomy, recent research and space flight observations of the planets, moons, and other solar system objects. Explores light and gravity to understand formation, properties and motion of Solar System objects.

### ASTR 104 — Introduction to Cosmology

- **Units:** 3
- **Hours:** 54 contact hours total
- **Transfers to:** CSU, UC
- **Offered:** not on the Summer 2026 schedule

Principles of astronomy stressing the origin, structure, and evolution of the universe. Discussions to include light, matter, gravity, stellar evolution, cosmology, relativity, the Big Bang Theory, and the expansion of the universe. Former Title: ASTR 112, Introduction to Cosmology (Fall 2023)