Big Ideas
Lvl 1

• Stars are made of hot gas.
• Long ago, stars made the tiny bits that make everything, including you.
• When stars explode, they spread these bits everywhere (called elements).

• After the Big Bang, there was mostly hydrogen and helium.
• Stars fused these into heavier elements like carbon, oxygen, iron.
• When massive stars die, they explode (supernova) and scatter those elements.

• At least 2 different colors of play dough

Timeline Entries
380,000 years after the Big Bang – First Atoms Form
The universe cooled enough for protons and electrons to join together, creating hydrogen and helium atoms. Light could finally travel freely.

100–200 million years after the Big Bang – First Stars Ignite
Gravity pulled together huge clouds of hydrogen and helium, forming the very first stars. These stars lit up the universe for the first time.

Level 1 Discussion Questions

1. What was the universe like before stars were born?

• Sample Answer: “It was dark and full of gas clouds, but no stars or planets yet.”

• Sample Answer: “Gravity pulls gas together until it makes a star.”

• Sample Answer: “The star cooks little atoms into bigger ones, like turning hydrogen into helium.”

• Sample Answer: “They can explode and spread all the elements everywhere.”

• Sample Answer: “Because stars made the stuff we’re made of—like the iron in our blood and the oxygen we breathe.”

• Sample Answer: “It means the atoms in our bodies were made long ago inside stars.”

• Sample Answer: A star is a huge ball of hot gas that shines with its own light. Stars form when clouds of gas, mostly hydrogen and helium, are pulled together by gravity. As the gas is squeezed tighter, it gets hotter until nuclear fusion begins, creating a star.

• Sample Answer: Nuclear fusion is a process where atoms are squeezed together to form new, heavier atoms. In stars, hydrogen fuses into helium, and later helium can fuse into even heavier elements. Fusion produces the energy that makes stars shine and creates the elements we find in planets and living things.

• Sample Answer: Stars die because they run out of fuel for nuclear fusion. Small stars like the Sun shrink into white dwarfs. Massive stars explode as supernovas, spreading elements into space that can become part of new stars, planets, and even living things.

• Sample Answer: This means the elements in our bodies—like carbon, oxygen, and iron—were originally made inside stars. When stars exploded, that material spread through space and eventually became part of Earth and all living things.

• Sample Answer: By studying stars, we learn about how elements are made, how planets and solar systems form, and the history of the universe. It helps us understand where everything around us came from, including ourselves.

4 Day Schedule