Main sequence

High school (ages 12+)
Space & Astronomy

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/main-sequence

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How heavy is Main sequence?More massive main sequence stars are significantly more luminous and hotter
2. What is the main sequence of stars?The main sequence is the longest, most stable part of a star’s life where it fuses hydrogen into helium in its core, producing light and heat.
3. Why do stars stay on the main sequence for billions of years?Because the outward pressure from hydrogen fusion balances gravity, keeping the star stable and letting it use its hydrogen fuel slowly.

Hydrostatic Equilibrium: The balance between outward pressure and inward gravitational force that keeps a star stable.
Metallicity: The abundance of elements heavier than helium in a star, used as an indicator of its chemical composition.
Stellar Evolution: The process of change a star undergoes throughout its lifetime, from birth to death.