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Astronomy

The Solar System

A High School & College Primer on the Sun, Planets, and How It All Holds Together

Astronomy class just assigned a unit on the solar system, and the textbook is 600 pages long. Your exam is in a week. This guide is not that textbook.

TLDR: The Solar System is a focused, 10–20 page primer that takes you from "what even is the solar system" to a working understanding of gravity, orbits, planetary formation, and the tools astronomers use to study it all — without burying you in details you don't need yet.

The book opens by orienting you to real distances and sizes (because the numbers are genuinely hard to picture). It then walks through Newtonian gravity and Kepler's three laws — the engine behind every orbit — with worked examples you can follow step by step. A chapter on the nebular hypothesis explains why rocky planets ended up close to the Sun and gas giants ended up far out. The planet-by-planet tour hits the features that actually appear on exams and in class discussions. The final section covers how we know any of this: spectroscopy, spacecraft flybys, and what kinds of evidence each method actually provides.

This is a solar system study guide for high school and early college students who need to get oriented fast. It's also a practical resource for parents helping kids prep for a test, or tutors who need a clean, accurate overview before a session.

If you want to understand the solar system — not just memorize it — pick this up and read it in one sitting.

What you'll learn
  • Identify the major components of the Solar System and describe how they are organized.
  • Explain how gravity and Kepler's laws govern the motion of planets, moons, and comets.
  • Describe the nebular hypothesis and why the inner and outer planets ended up so different.
  • Distinguish terrestrial planets, gas giants, ice giants, and small bodies (moons, asteroids, comets, dwarf planets).
  • Connect observational evidence (telescopes, spacecraft missions) to what we claim to know about the Solar System.
What's inside
  1. 1. What the Solar System Actually Is
    Orients the reader to the Sun, planets, moons, and small bodies, and to scales of distance and size.
  2. 2. Gravity and Orbits: Why Planets Don't Fly Off
    Introduces Newtonian gravity and Kepler's three laws as the rules that govern every orbit in the Solar System.
  3. 3. How the Solar System Formed
    Walks through the nebular hypothesis and explains why rocky planets formed close in and gas giants formed far out.
  4. 4. A Tour of the Planets and Their Neighbors
    Surveys the terrestrial planets, gas and ice giants, and the major small-body populations with the features worth remembering.
  5. 5. How We Know: Telescopes, Spacecraft, and Evidence
    Explains the observational and experimental tools astronomers use, from spectroscopy to flyby missions, and what kinds of claims each supports.
Published by Solid State Press
The Solar System cover
TLDR STUDY GUIDES

The Solar System

A High School & College Primer on the Sun, Planets, and How It All Holds Together
Solid State Press

The Solar System

A High School & College Primer on the Sun, Planets, and How It All Holds Together

Copyright © 2026 Solid State Press.

Published by Solid State Press.

All rights reserved. No part of this book may be reproduced or transmitted in any form without prior written permission, except for brief quotations in critical reviews and educational use.

Part of the TLDR Study Guides series.

Who This Book Is For

If you need a solar system study guide for high school — whether you're prepping for an AP Earth Science space unit review, working through an intro astronomy course, or helping a student the night before a test — this is the book. It's also a solid short astronomy book for college freshmen who want a clear foundation before lectures pull them into the details.

This primer covers planets and orbits explained simply, the Kepler and Newton gravity framework students always find intimidating, how the solar system formed, and the evidence behind everything we think we know — telescopes, spacecraft, and the data they've returned. Think of it as an astronomy primer for beginners at the high school and early college level: about 15 pages, no padding, no detours.

Read it straight through first. Work every numbered example as you hit it, then tackle the problem set at the end. That sequence — read, work, test — is where the understanding actually locks in.

Contents

  1. 1 What the Solar System Actually Is
  2. 2 Gravity and Orbits: Why Planets Don't Fly Off
  3. 3 How the Solar System Formed
  4. 4 A Tour of the Planets and Their Neighbors
  5. 5 How We Know: Telescopes, Spacecraft, and Evidence
Chapter 1

What the Solar System Actually Is

Everything orbiting the Sun — rocks, gas, ice, dust, and the eight planets — makes up the Solar System. The Sun sits at the center, and everything else is gravitationally bound to it, meaning the Sun's gravity keeps every object from simply drifting off into interstellar space. Before getting into how any of this works (that comes in the next section), it helps to know what the players are and how they're arranged.

The Sun and the Planets

The Sun is not just the center of the Solar System — it is, by an almost absurd margin, most of it. The Sun contains about 99.8% of all the mass in the Solar System. Everything else — all eight planets, their moons, every asteroid and comet — shares the remaining 0.2%. That mass imbalance is the reason the Sun runs the show gravitationally.

A planet is a body that orbits the Sun, has enough gravity to pull itself into a roughly spherical shape, and has gravitationally "cleared" its orbital neighborhood — meaning it dominates its zone of space. The eight planets, in order from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. They divide neatly into two groups. The four inner planets (Mercury through Mars) are terrestrial planets: small, rocky, and dense. The four outer planets are much larger. Jupiter and Saturn are gas giants, composed mostly of hydrogen and helium gas. Uranus and Neptune are ice giants, composed mostly of water, methane, and ammonia in slushy, compressed forms — despite the name, not literal ice. Section 4 covers each planet's characteristics in depth.

Most planets have moons — natural bodies that orbit a planet rather than the Sun directly. Earth has one. Mars has two small ones. Jupiter has nearly 100 confirmed moons, including Ganymede, which is larger than the planet Mercury. Moons are bound by exactly the same gravitational rules that bind planets to the Sun; they just orbit a planet instead.

Small Bodies: Asteroids, Comets, and Dwarf Planets

Keep reading

You've read the first half of Chapter 1. The complete book covers 5 chapters in roughly fifteen pages — readable in one sitting.

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