SOLID STATE PRESS
← Back to catalog
The Sun: How Our Star Works cover
Coming soon
Coming soon to Amazon
This title is in our publishing queue.
Browse available titles
Astronomy

The Sun: How Our Star Works

Fusion in the Core, the Convection Zone, and the Solar Wind — A TLDR Primer

Your astronomy unit just covered fusion, sunspots, coronal mass ejections, and the solar wind, and none of it clicked. You need a straight answer to how does the sun make energy — not another textbook page that buries the physics under jargon.

This TLDR primer walks you through the Sun from the inside out. It starts in the core, where hydrogen fuses into helium and E=mc² turns lost mass into the light and heat that reach Earth eight minutes later. From there it traces that energy outward through the radiative and convection zones to the visible surface, then out into the chromosphere and corona — including the still-unsolved mystery of why the outer atmosphere is hotter than the surface below it.

A full section covers magnetic activity: what causes solar flares, why sunspots follow an eleven-year cycle, and how the solar dynamo drives it all. The last section connects that activity to things you actually experience — auroras, satellite disruptions, power-grid risk — and ends with the Sun's own future as a red giant and, eventually, a white dwarf.

Written for high school and early college students who want a working guide for astronomy homework help, this book is short by design: no filler, no derivations you don't need, just the concepts explained clearly with worked examples where the numbers matter. Parents and tutors prepping a session will find it just as useful.

Open it, read it once, and walk into your next class or test actually understanding how a star works.

What you'll learn
  • Describe the Sun's basic properties, composition, and place among stars
  • Explain proton-proton fusion and how energy escapes the core
  • Identify the Sun's internal layers and outer atmosphere and what each does
  • Connect sunspots, flares, and CMEs to the solar magnetic cycle
  • Understand how the Sun drives space weather and shapes life on Earth
What's inside
  1. 1. Meet the Sun: A Middle-Aged G-Type Star
    Introduces the Sun's size, mass, composition, age, and its classification among stars.
  2. 2. The Core: How Fusion Powers the Sun
    Explains the proton-proton chain, energy release via E=mc², and why fusion only happens in the core.
  3. 3. From Core to Surface: The Sun's Interior Layers
    Traces energy's journey through the radiative zone and convection zone to the photosphere.
  4. 4. The Solar Atmosphere: Chromosphere, Corona, and Solar Wind
    Covers the outer atmosphere, the coronal heating problem, and how the Sun continually loses mass.
  5. 5. Magnetic Activity: Sunspots, Flares, and the 11-Year Cycle
    Explains the solar dynamo, sunspot cycle, flares, and coronal mass ejections.
  6. 6. Why It Matters: Space Weather, Earth's Climate, and the Sun's Future
    Connects solar activity to auroras, satellites, and power grids, and outlines the Sun's eventual death as a red giant and white dwarf.
Published by Solid State Press
The Sun: How Our Star Works cover
TLDR STUDY GUIDES

The Sun: How Our Star Works

Fusion in the Core, the Convection Zone, and the Solar Wind — A TLDR Primer
Solid State Press

The Sun: How Our Star Works

Fusion in the Core, the Convection Zone, and the Solar Wind — A TLDR Primer

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.

Contents

  1. 1 Meet the Sun: A Middle-Aged G-Type Star
  2. 2 The Core: How Fusion Powers the Sun
  3. 3 From Core to Surface: The Sun's Interior Layers
  4. 4 The Solar Atmosphere: Chromosphere, Corona, and Solar Wind
  5. 5 Magnetic Activity: Sunspots, Flares, and the 11-Year Cycle
  6. 6 Why It Matters: Space Weather, Earth's Climate, and the Sun's Future
Chapter 1

Meet the Sun: A Middle-Aged G-Type Star

The Sun is a star, and stars are just enormous balls of gas held together by their own gravity and powered by nuclear fusion in their cores. It sits at the center of our solar system, about 93 million miles away — a distance so useful in astronomy that it has its own name, the astronomical unit (AU). One AU equals roughly 150 million kilometers, and astronomers use it as a yardstick for distances throughout the solar system. Light, traveling at about 300,000 km/s, takes roughly 8 minutes to cross that gap, which means whenever you look at the Sun (never directly — more on why in Section 4), you're seeing it as it was 8 minutes ago.

Size-wise, the Sun is almost incomprehensibly large compared to Earth. Its diameter is about 1.4 million kilometers — you could line up 109 Earths side by side across it. Its mass is about 1.99×1030 kilograms, which is so central a number in astronomy that scientists just call it a solar mass and use it as a unit: a star described as "0.5 solar masses" is half as massive as the Sun. The Sun alone makes up about 99.8% of all the mass in the solar system — everything else, all eight planets, every moon and asteroid and comet, is a rounding error by comparison.

Composition-wise, the Sun is overwhelmingly hydrogen and helium. By mass, it's about 71% hydrogen and 27% helium, with the remaining 2% made up of heavier elements astronomers lump together and call "metals" (confusingly, this includes things like oxygen and carbon, not just metals in the everyday sense). This matters because hydrogen is the fuel: as you'll see in Section 2, the Sun generates its energy by fusing hydrogen into helium in its core. The Sun didn't manufacture this hydrogen itself — it inherited it from the cloud of gas and dust that collapsed to form the solar system about 4.6 billion years ago, mostly hydrogen and helium left over from the Big Bang, seasoned with heavier elements from earlier generations of stars that lived and died before the Sun was born.

About This Book

If you're a high school student in Earth Science or Astronomy class wondering how does the Sun make energy, a college freshman cramming for an intro astro exam, or a parent looking for sun facts for high school astronomy to quiz your kid with, this book is for you. It's also solid astronomy homework help for teens who need a clear explanation fast, not a 400-page textbook.

This is a quick guide to how stars work, built around the Sun as the star we can actually see up close. You'll get a plain-language walk through the fusion reactions in the core, the layers between core and surface, and the atmosphere above it — including what causes solar flares and why does the Sun have sunspots. There's a dedicated explain-solar-wind-for-students section covering how charged particles stream outward and shape space weather near Earth. A concise overview with no filler.

Read it start to finish, work through the examples as you go, then test yourself with the problem set at the end.

Keep reading

You've read the first half of Chapter 1. The complete book covers 6 chapters — readable in one sitting.

Coming soon to Amazon