List of Lessons | Subjects

Understanding Astronomy

by Ron Kurtus (updated 16 March 2023)

Astronomy is a branch of Physical Science that is concerned with the study of objects and effects in space or regions beyond the Earth's atmosphere.

I've always been interested in space and the stars. I realized that knowledge of Astronomy is important for an understanding of the Universe and even how the Earth was formed.

The purpose of these lessons is to help you gain understanding the basics of Astronomy, such that you will become a champion in the subject.

Astronomy Contents


Observations in Astronomy

Solar System

Our Solar System

Kepler's Laws of Orbital Motion

Characteristics of our Sun

Earth and Moon

Characteristics of the Earth

Motion of the Earth

Characteristics of our Moon

Motion of the Moon

Phases of the Moon


Mercury (coming soon)

Mars (coming soon)


Jupiter's 67 Moons

Jupiter's Galilean Moons

Saturn (coming soon)


Characteristics of our Universe

Astronomical Distances



Black Holes

Big Bang Theory

Theory of Multiple Universes

Bigger Bang Theory


Spectrometer Useful in Astronomy


Astronomy Resources

Graded Tests on Astronomy

Physical Science



Physics Resources

Survey results

See results of survey questions

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