Stars and Galaxies

The closest star to us

• The sun

A cluster of stars • A galaxy is a cluster of stars together

The universe

• The universe is everything in space

The different types of universes

Stars make up galaxies which make up the universe

The different types of galaxies

• Draw three boxes each with a title and a picture of the galaxy in the box

Spiral Galaxy Irregular GalaxyElliptical Galaxy

What makes one star different from another?

1. Mass determines lifespan of star2. Flame demonstration: predict on left side

order from coolest to hottest.(orange, white, yellow, red, blue)

The color of a star tells its surface temperature

• Remember: ROYWB• A star’s color tells you how hot its surface is.

From coolest to hottest: • Red, orange, yellow, white, blue

Size of stars

A star is born

Nebulas- dust and debris collecting in space

Protostar

• Star is being formed from nebula dust and debris

Star is formed=main sequence

Dying star

Super nova

• Explosion moving at about 6 million mph!!

OR

White dwarf star Black dwarf star

A star has died

• Neutron Star• If the star is at least 1.5 but

less than 9 times larger than the Sun, the core left after the supernova will collapse into a neutron star. This is a star composed only of neutrons.

• Black Hole• If the star is at least 9 or

more times larger than the Sun, the core will continue to collapse into a black hole, an extremely dense area with a strong gravitational pull that light can not escape.

Neutron Star or Black Hole?

Types of Galaxies – Quasars…

• A quasar is a distant galaxy with a black hole at its center.

• As enormous amounts of gas revolve around a black hole, the gas heats up and shines brightly.

See board

• Diagram of Stars life

Life cycle of a star (no dwarfs here)