Stellar Evolution & Explosions

Stellar Evolution & Explosions

Unit 7 Part 2

Evolution = end of a star's life

Multiple Choice

High-mass stars burn hotter & brighter because they have more _______ at their cores.

• fusion

• fuel

• energy

• pressure

Multiple Choice

When temperatures are high enough in the core of a high-mass star, this element starts to form.

• helium

• carbon

• oxygen

• hydrogen

Optional video link on Student Notes Pages

Optional video link on Student Notes Pages

Multiple Choice

When an ______ core is reached in a high-mass star, gravity takes over.

• iron

• carbon

• oxygen

• helium

Multiple Choice

When an iron core is reached gravity takes over and a(n) _________ occurs.

• black hole

• neutron star

• quasar

• supernova

Multiple Choice

Supernovas are one of the largest _______ in the Universe.

• events

• stars

• explosions

• objects

Multiple Choice

All elements heavier than carbon were formed in supernova explosions.

• True

• False

Multiple Choice

_____ stars evolve and move off the main-sequence first; then intermediate stars & so on.

• Low-mass

• Red giant

• High-mass

• White dwarf

Multiple Choice

The dividing line between high & low-mass stellar evolution is called the

• dividing line.

• main sequence turn off.

• zero-age main sequence.

• HR Diagram.

Multiple Select

Close binary star systems that share stellar material can affect how each star _____.(check all that apply)

• lives

• evolves

• functions

• interacts

Optional video link on Student Notes Pages

Multiple Choice

Term for "new star" that occurs in mass-transfer binary and/or white dwarf companion stars.

• supernova

• stella nova

• pulsar

• neutron star

Multiple Choice

As material is added to the accretion disk, _____ may reach a temporary fusion point.

• pressures

• electron degeneracy

• temperatures

• matter

Multiple Choice

Contact binaries may allow a white dwarf star to repeatedly

• electron degeneracy pressure.

• Roche lobe overload.

• flash or explode.

• implode.

Multiple Select

A supernova occurs when a _____ star runs out of fuel (or overloads) and explodes. (check all that apply)

• sun-like

• single

• massive

• double

Multiple Choice

A ____ star with a mass of 1.4 suns may go supernova (I) if too much material accretes.

• white dwarf

• red dwarf

• red giant

• neutron

Multiple Choice

Type II supernovae occur when a star with at least ____ times the mass of our sun explodes.

• 1.4

• 1.5

• 3

• 8

Multiple Choice

Supernovae regularly occur in galaxies throughout the visible Universe.

• True

• False

Optional video link on Student Notes Pages

We don't see what is in a black hole, rather we see the acretion disk around it of what is "falling in"

Multiple Select

Type II supernovae explosions may leave behind a (check all that apply)

• neutron star

• black hole

• pulsar

• white dwarf

Multiple Choice

_____ are rapidly spinning neutron stars that are known as "lighthouses" in space.

• Quasars

• White dwarfs

• Pulsars

• Black holes

Multiple Choice

We can see black holes because

• light can escape it

• energy can escape it

• I have x-ray vision

• we see the light of the stars at its event horizon, they reflect off of objects around the accretion disk