Science:Chapter four section 3: lives of stars

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stars can live up until

200 billion years

1c How is a protostar different from a star.

A protostar is a contracting cloud of gas and dust with enough mass to form a star while a star is made up of large amount of gas and relatively small volume.

2a What factor determines how long a star lives?

A star's life is determined by a stars mass.

3a What is a white dwarf? How is it different from a neutron star?

A white dwarf is the blue-white hot core of a star that is left behind cools while a neutron star is the remains of high mass stars after a supernova.

1a What is nebula?

It is a large cloud of dust and gas spread out in an immense volume.

Star

Made up of large amount of gas and relatively small volume

3b Why do some stars become white dwarfs and others become neutron stars or black holes.

Stars because of the gravity become neutron or black holes with more mass while stars with less mass become white dwarfs.

2b A star is twice as massive as the sun. Will its lifespan be longer, shorter, or the same as that of the sun.

The lifespan will be shorter from the sun because the bigger the mass of the star, the shorter the lifespan.

supergiants

The most luminous, most masive stars,with diameters greater than 100 times the diameter of the sun.

3c What will happen to the sun when it runs out of fuel.

The sun, because it is a medium-mass star will either turn into a neutron or black holes because it has enough mass for those while it has too much mass to become a white dwarf.

1b How how does a star form from a nebula?

When the contracting gas and dust from nebula become so dense and hot that nuclear fusion starts.

When is a star born?

When the contracting gas and dust from nebula become so dense and hot that nuclear fusion starts.

Protostar

a contracting cloud of gas and dust with enough mass to form a star

black dwarf

after years, white dwarf eventually fades and becomes a black dwarf

red giant

as low mass stars run out of fuel, their outer layers expand and becom red giants

jocelyn bell

british astonomer detected radio waves and thought it was LGM or little green men. soon they realized it was actually a rapidly spinning nuetron star.

supernova

high mass stars quickly evolve to supergiants. when supergiant runs out of fuel, it can explode suddenly.the explosion is called supernova.

when a star begins to run out of fuel

its core shrinks and it outer portion expands and it becomes a white dwarf, a nuetron star, or a black whole.

Nebula

large cloud of dust and gas spread out in an immense volume. comes form low mass stars turn to red giants and the outer parts still grow and drift out into space(gas cloudthe remains of high mass stars after a supernova.

stars with more mass

last shorter than stars with less mass

How long a star lives depends on its

mass

sun is a mass star

medium

pulsars

spinning neutron stars. some spin 100 times per second!

White dwarf

the blue-white hot core of a star that is left behind cools. only about size of the sun. no fuel. much more dense than sun.

Nuclear fusion

the combination of the nuclei of small atoms to form a larger nucleus; releases energy

Black wholes

the most massive star may become black wholes when they die. a black whole is and object so strong, not even light can escape it.

nuetron stars

the remains of high mass stars after a supernova. smaller and denser than white dwarfs. it is denser than the sun but can be the size of a city


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