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Meet Sylvester. Sylvester is a protostar. A 

protostar is something that is almost ready to be 

a real star.

Hi there!

1

Sylvester is smaller than the average protostar. 

Sylvester

2

Still, that didn't mean his dreams were small. 

Sylvester wanted to become a supergiant, one of 

the largest stars in the universe!

  l   l

 O

3

Since he was small, he was made fun of by the other 

stars. "Haha," the red star said, "you're the tiniest 

star Sylvester. You'll never become a supergiant." 

"Yeah", the yellow star said, "get used to it". 

4

Sylvester knew they were lying and trying to be 

mean to him, but over time he started to believe the 

other stars. "Maybe I'm not good enough to become 

a supergiant," he said sadly to himself, and started 

crying. 

5

The whole time, an old and wise white dwarf 

star had been watching Sylvester. 

6

The star floated up to Sylvester and said "You 

know, I was just like you when I was a 

protostar. It was my dream to become a 

supergiant as well."

?

You know...

7

"But I was made fun of and told I 

couldn't become one."

8

"I believed them too. I was sad for many years, 

but one day, I decided I was tired of people 

telling me what I could and could not do." 

9

"I worked and worked, trying my best, and eventually I 

reached my goal. I may not look like it anymore, but I 

used to be a supergiant. A supergiant becomes a white 

dwarf, like I am now."

Wow, I can't 

believe you were 

once a supergiant!

10

"My point is, don't believe those bullies. If you 

work hard enough and believe in yourself, you can 

become a supergiant star." And with that, the 

white dwarf left.

Bye!

11

Sylvester took these words to heart. He worked 

all the time, spinning around to gather dust and 

gas, making him grow larger and larger.

12

Sylvester did this for a while. He span for years, 

trying to gather enough dust to make the inside of 

him heat up so he could turn into a real star, but 

nothing happened.

13

He was losing hope. Once again, he sadly said, 

“I’ll never become a supergiant,” and began to 

cry. 

Why isn't it 

working?

14

Suddenly, Sylvester felt something. He had achieved 

nuclear fusion! This is when a protostar becomes hot 

enough to become a real star. Sylvester had reached his 

first step on his way to his goal. 

15

Sylvester felt like a rock star. He had proved all of the 

other stars wrong, he could become a supergiant. He 

knew that the old man would’ve been proud of him if he 

were still there. 

16

He was now in the main sequence stage, where 

stars burn the element hydrogen inside of them. 

For many years, Sylvester was happily burning 

through his hydrogen supply. 

This is great!

17

Eventually, Sylvester grew older burning the 

hydrogen inside of him, and ran out of it. He 

suddenly started to crash in on himself. “Oh no!” 

Sylvester thought.

18

What Sylvester didn't realize, is that when he 

burned hydrogen, he made a new element, called 

helium! He started burning the helium now. He 

also noticed that he had worked hard and grown 

a lot.

I grew!

19

As he burned the helium, he saw that he was 

growing! The energy he made by burning that 

helium made him get bigger!

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   O

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