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Birth of A Star

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Christina Arnold

on 26 October 2017

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Transcript of Birth of A Star

forms: interstellar clouds of dust and gas (mostly hydrogen) that undergo gravitational collapse and compress to form a rotating gas globule.

All stars are born like this!
Main Sequence

1. Nuclear fusion begins.
-Converting hydrogen into helium (see pic)
2. A star will remain in this state for about 10 billion years
3. Hydrogen fuel is depleted and the star begins to die :(

The death of stars!
(with a mass up to 1 and 1/2 times that of the Sun)
: is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months.
A degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation

How do you think stars are born and die?
As gravity continues to pull the cloud together a
forms, but its core is not yet hot enough for fusion to take place. The dust just rotates around.
Lets Review: say each stage!
Stars die differently depending on their size. First we will talk about the death of a
size star then a
size star.

Remember all stars go through the first three stages!
1. Nubula
2. Protostar
3. Main Sequence

The next stage depends on what size it is.
Death of a
star (remember the first three stages? )

A massive star can die as a neutron star or a
Evidence of a black hole.
If we have time, Stephen Hawking's Review of the life cycle of stars.
Stephen Hawking's Theory of black holes (If time!)
Sounds from space
Red Giant
: a very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.
planetary nebula
, is a kind of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from old red giant stars late in their lives.
WHITE dwarf
a small very dense star that is typically the size of a planet. A white dwarf is formed when a low-mass star has exhausted all its central nuclear fuel and lost its outer layers as a planetary nebula.
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light.

Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (13.8 billion years), no black dwarfs are expected to exist in the universe yet, and the temperature of the coolest white dwarfs is one observational limit on the age of the universe.
Super Red Giant
A red supergiant is an aging giant star that has consumed its core's supply of hydrogen fuel.
Super Nova
a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
Most known neutron stars belong to a subclass known as pulsars
Neutron Star-very high density, composed predominantly of closely packed neutrons
black hole
is a region in space where the pulling force of gravity is so strong that light is not able to escape. The strong gravity occurs because matter has been pressed into a tiny space. This compression can take place at the end of a star's life. Some black holes are a result of dying stars.
On March 28, 2011, NASA's Swift detected intense X-ray flares thought to be caused by a black hole devouring a star. In one model, illustrated here, a sun-like star on an eccentric orbit plunges too close to its galaxy's central black hole. About half of the star's mass feeds an accretion disk around the black hole, which in turn powers a particle jet that beams radiation toward Earth.
Not a stage! Just something Stars can become
Full transcript