Download Twinkle, Twinkle, Little Star

TWINKLE, TWINKLE,
LITTLE STAR
BrainPOP: Life Cycle of Stars
What are stars?
Giant balls of gas that
undergo nuclear fusion.
Nuclear fusion is when the nuclei
of two atoms join together to make
a bigger nucleus and release energy.
1.
2.
3.
4.
Composition (what it is made of)
Size
Color (temperature)
Brightness
Find it
on
pg.93!
Composition
Stars are made up of mostly two gases, which ones are they?
2%
25%
Hydrogen
Helium
73%
Other
Size
Supergiant
or
Giant
Main
Sequence
Dwarf
The Sun
Our Sun is a main sequence, yellow star.
Sun Song
Its not the biggest OR the hottest in the universe!
Brightness
The brightness of a star depends on both the size and
temperature of the star.
But, how bright it APPEARS to us
depends on how far it is from
Earth and how bright it truly is.
We can measure a star’s
brightness in two ways:
How bright a star
appears from Earth.
(depends on star’s
distance from Earth)
How bright a star
actually is.
(depends on
Stars can appear brighter or dimmer
depending on their distance from Earth.
Which headlights are brighter? Why?
In Class Example
Exit Slip: Stars
1. What 5 characteristics are used to classify stars?
2. What can the color of a star tell you about it?
3. Which color star is hottest?
4. What size and color is our Sun?
5. Stars are made of mostly which two gases?
Hertzsprung-Russell Diagram
Over 90% of all stars
(including our Sun) are
main sequence stars.
OMG, when is the
sun going to die?!?
The Sun’s estimated life is 10
billion years…
AND….
The sun is halfway through its life!
Characteristics of Stars Worksheet
Answer # 1-5