Introductory Astronomy And Astrophysics Direct

: Formation and dynamics of planets, moons, asteroids, and the Sun.

Depending on your mathematical background, different resources may be more suitable: Astronomy: A Free, Online Astro 101 Textbook Introductory Astronomy and Astrophysics

: Spherical astronomy, celestial mechanics (gravity and motion), and astronomical instruments like telescopes and spectrographs. : Formation and dynamics of planets, moons, asteroids,

A standard introductory course typically begins with fundamental physics and Earth-based observations before moving to the broader cosmos: : Formation and dynamics of planets

: Understanding the electromagnetic spectrum, photometry, and how light reveals the temperature, mass, and composition of stars.

: The internal structure of stars, nuclear fusion reactions, and the life cycles of stars—from formation to remnants like white dwarfs, neutron stars, and black holes.