STARS

What is a star?

• A star is a enormous ball of glowing gas.• There are approximately

70,000,000,000,000,000,000,000(70 sextillion).

• On a dark clear night we can only see about 3,000 stars with our eyes.

• The closest star to us is the Sun.

This is what we see when we look up at night.

Constellations

• Are a group of stars that are connected together to make a picture (like connect the dots)

• They were used but early explorers to navigate the sea at night

• All together there are 88 constellations in the night sky.

Big Dipper – not one

Big Bear – Ursa what?

Leo

Dragon

Where do stars come from?

• About 15 billion years ago there was a huge explosion.

• This huge explosion was known as The Big Bang.

• Scientist believe that this huge explosion gave birth to the stars and planets

THE BIG BANG

The Sun

• Closest star to our planet Earth.• Our sun is a medium-sized star. • It is about 333,000 times the mass of the

Earth.• The Sun will burn fuel for about 5 billion

more years (middle-aged star)• It’s surface temperature is 11,000°F

The Sun from Earth

Life Cycle of Stars• Stars are born in nebulas also know as star

nurseries. These are clouds of hot gases.• Stars then go into a main sequence stage where it

starts to burn fuel and glow.• The star burns out it’s fuel it glows less and begins

to expand. This star is called a Red Giant.• The star will eventually collapse and explode this

is know as the Supernova stage.(only the ones much bigger than our sun – 8 x or more)

• Depending on it’s size it then will become either a dwarf star, neutron star, or black hole.

Shiloh NEWS:

Mr. C’s Class Travels to SPACE

to visit far way stars

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4

3

2

1

What the sun really looks like!

                                                                                                                                                                                                                        

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Nebula- Star Nursery

Nebula

Nebula

Star Colors

• Red stars are the coolest stars (below 2,500-5,000°F)

• Orange Stars (getting hotter)• Yellow stars - (getting hotter)

(6,000-12,000°F)

• White Stars (getting hotter)• Blue Stars are the hottest

(32,000-1,600,000°F or higher)

Red Giant

The star burns out it’s fuel it glows less and begins to expand. This star is called a Red Giant.

Orange Star

Yellow Star

White Dwarf (small stars become this, don’t Supernova)

Sirius, the brightest star

Orion, my favorite constellation

North Star, used to navigate, also called Polaris (always visible)

Hubble Space Telescope

Space Probes: Pioneer Venus

Pioneer 10 – off to Jupiter

Voyager 1 and 2

• Sent off to check out the 4 gas giants in 1977 and is still going beyond…

Blue Star

Black Dwarf

Before Supernova

Supernova

This BIG star will eventually collapse and explode this is know as the Supernova stage (small stars don’t explode).

Energy released in Supernova explosion

Neutron Star- leftover from Supernova

Neutron Star

Neutron star pulls other stars into them.

Black Hole- depending on the stars size it then

will become either a black dwarf, neutron star, or black hole.

Shiloh NewsMr. C’s Class land

back on Earth safely