The Sun/Life Cycle of Star

The Sun/Life Cycle of Star

Learning Intentions:

1. We are learning to explain the different characteristics of our Sun.

2. We are learning to understand the life cycle of a star.

The Sun

The Sun

• Our sun is a medium, yellow star

• Some stars are 8-300 times bigger, some are smaller like the size of Earth

• The Sun gives off thermal (heat) energy and light energy

• This energy comes from the Sun’s two main gasses: Helium & Hydrogen

• All that energy is what makes the sun shine

Multiple Choice

How would you describe our Sun?

• large red star

• extra large yellow star

• medium yellow star

• medium red star

Multiple Select

What type of energy does the sun give off? Check all that are right.

• thermal (heat)

• kinetic

• light

• friction

• motor

Multiple Select

Which two gasses power the Sun?

• Carbon

• Oxygen

• Nitrogen

• Helium

• Hydrogen

Characteristics of Stars

• Our Sun looks like the brightest because it is so close

• A star's size, temperature, and distance from us determines their brightness

• Color of stars tells you their temperature

• Red are the coldest

• Orange and yellow are the next hottest (This is our sun which is 9,941^oF)

• Blue and white stars are the hottest (can get up to 100,000^oF)

Fill in the Blanks

Multiple Choice

Which color star is hottest?

• red

• yellow

• orange

• blue

Life Cycle of a Star

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Beginning of a Star

• Stars form in a cloud of dust and gas called a Nebula

• Gravity begins to pull the dust and gas into a ball

• The temperature gets hotter as hydrogen and helium form releasing a bunch of energy

• By the end of this, the ball of particles and energy officially becomes a star

Multiple Choice

Stars form in a cloud of dust and gas which is called a _______

• chromosome

• stellar

• photosphere

• nebula

Ending of Stars (SUN)

• Our sun is about 4.5 billion years old and is halfway through its "life"

• In billions of years, our sun's fuel (hydrogen) will run out

• As it dies, our Sun will expand and get bigger. About 170 times it size and stretch to where Mars is

• The Sun will cool down and turn red and is called a Red Giant

• When all the fuel is gone, the core (center) of the sun will shrink and be called a White Dwarf

Multiple Choice

What happens to our sun as it starts to "die"?

• It expands and is bigger

• It explodes

• It moves away from us

• It has more solar flares

Multiple Choice

When our sun begins to cool down and change colors, what is it called?

• Supernova

• Nebula

• Red Giant

• Black Hole

Multiple Choice

What is the last stage of our Sun's life?

• Supernova

• Nebula

• Red Giant

• White Dwarf

Other Stars End of Life

• Bigger stars grow into Red Supergiants as they use up the core's energy

• All this energy causes a huge explosion called a Supernova

• The leftover is called a Neutron Star

• If the star was big enough, the gravity from the core will continue to shrink in on itself and cause a black hole

• A black hole is a part of space where the gravity is so strong it pulls anything near it into it and it can't escape

Multiple Choice

What is the explosion of Supergiant star called?

• Neutron

• White Dwarf

• Supernova

• Nebula

Multiple Select

What are the two options a bigger star can end up as when it explodes?

• Neutron Star

• White Dwarf

• Supernova

• Black Hole

• meteor

Multiple Choice

True or false, nothing can escape a black hole.

• true

• false