Chapter 3Chapter 3Stars & GalaxiesStars & Galaxies

What is a huge What is a huge collection of stars collection of stars

called?called?galaxygalaxy

What is the sum of What is the sum of absolutely everything absolutely everything

that exists? that exists? The universeThe universe

How is the universe How is the universe changing all the changing all the

time?time?It is constantly expanding & It is constantly expanding &

things are moving away from things are moving away from one another. one another.

What is the name of a What is the name of a cool, dark, dead star?cool, dark, dead star?

Black dwarfBlack dwarf

What is the measure of What is the measure of how bright a star how bright a star

appears to be called?appears to be called?Apparent magnitudeApparent magnitude

The explosion of a The explosion of a star is called a star is called a

__________. __________. supernovasupernova

What kind of gas What kind of gas gives stars their gives stars their

energy?energy?hydrogenhydrogen

Name the three kinds Name the three kinds of galaxies. of galaxies.

Elliptical, spiral, irregularElliptical, spiral, irregular

What is the name of What is the name of our galaxy?our galaxy?

The Milky WayThe Milky Way

What kind of galaxy What kind of galaxy is the Milky Way?is the Milky Way?

spiralspiral

What is the most What is the most common type of common type of

galaxy?galaxy?ellipticalelliptical

Which color stars are Which color stars are the hottest? Which are the hottest? Which are

the coolest?the coolest?Blue stars are hottestBlue stars are hottestRed stars are coolestRed stars are coolest

When a massive stars When a massive stars dies, which two things dies, which two things

can it become?can it become?Black hole OR neutron starBlack hole OR neutron star

What is the first stage in What is the first stage in the life cycle of alll the life cycle of alll

stars?stars?nebulanebula

The distance that light The distance that light travels in a year is travels in a year is

called a _____________.called a _____________.Light yearLight year

What is the amount of What is the amount of light a star truly gives light a star truly gives

off called?off called?Absolute magnitudeAbsolute magnitude

Who discovered that Who discovered that galaxies could be galaxies could be

classified into three classified into three basic groups?basic groups?

Edwin HubbleEdwin Hubble

How does a star get How does a star get its energy?its energy?

Nuclear reactions in the Nuclear reactions in the center of the starcenter of the star

What determines a What determines a star’s color?star’s color?

The temperatureThe temperature

What is a region in What is a region in space where the space where the

gravitational pull is so gravitational pull is so strong that not even strong that not even light can escape it light can escape it

called?called?Black holeBlack hole

How does our star (the How does our star (the Sun) compare to other Sun) compare to other

stars in size?stars in size?It is quite small when It is quite small when

compared to other stars such compared to other stars such as Betelgueseas Betelguese

What is a collapsed red What is a collapsed red giant that shines dimly giant that shines dimly

called?called?White dwarfWhite dwarf

What is the dense What is the dense remains of a star’s core remains of a star’s core

after a supernova after a supernova explosion called?explosion called?

Neutron starNeutron star

The light that we see The light that we see from our Sun left there from our Sun left there

how long ago? how long ago? About 8 minutesAbout 8 minutes

Good Luck Good Luck