Transcript The life-cycle of a star

THE LIFE-CYCLE OF A STAR
BY EMILY GOODE YEAR 6
The life-cycle of a star
What is a nebula ?
A nebula is a cloud of
interstellar dust,
hydrogen and helium
gas, and plasma. I think
it looks like a portal to
another dimension.
What does it look like to
you?
Red giant phase
This happens to a star
when it starts to run out
of hydrogen. It starts to
cool and expands at the
same time. The centre
shrinks and the
atmosphere swells. It
looks a bit like a ball of
fire.
Planetary Nebula
Planetary Nebula are the
outer layers of a star
that are lost when the
star changes from a red
giant to a white dwarf.
It’s a bit like when a
snake sheds it’s skin and
reveals a new body.
White Dwarf
A white dwarf is what stars
like the Sun become after
they have exhausted their
nuclear fuel. Near the end
of its nuclear burning
stage, this type of star
expels most of its outer
material, creating a
planetary nebula. Only
the hot core of the star
remains.
White Dwarf
This hot core is the new white dwarf, which
typically has a temperature exceeding 100,000
Kelvin. The sun only has a temperature of 5,778
Kelvin. Which makes a young white dwarf over
17 times hotter than the sun. The white dwarf
cools down over the next billion years or so
unless it is accreting matter from a nearby
star. When a white dwarf is finished cooling
down it will still be 10,000 Kelvin, which is still
4,222 Kelvin more than the Sun's temperature.
QIUIZ TIME
Put these stages of a star in their
correct order
1.
2.
3.
4.
5.
Red Giant
Stellar Nebula
Planetary Nebula
Average Star
White Dwarf
Crossword
1. Which one of the stages is first?
2. Which stage has a temperature of 100,000
kelvin?
3. Which stage is like a snake shedding it’s skin?
4. Which stage looks like a song name?
5. What constellation has a belt?
6. What is our nearest star?
Answers
1. nebula
2. White dwarf
3. Planetary nebula
4. Red giant
5. Orion
6. Sun