evolution of star
DESCRIPTION
EVOLUTION OF STAR. SUPATSORN KIRDRATANASAK NATTHACHA CHAICHANA NOPPAVIT WONGCHAROEN. HOW STARS ARE BORN. NEBULA. PROTOSTAR. Gravity causes the densest parts to collapse, forming regions called protostar. - PowerPoint PPT PresentationTRANSCRIPT
EVOLUTION OF STARSUPATSORN KIRDRATANASAK
NATTHACHA CHAICHANANOPPAVIT WONGCHAROEN
HOW STARS ARE BORN
NEBULA
Orion Nebula
Gravity causes the densest parts to collapse, forming regions called protostar.
Protostar heats the gas and dust surrounding them and blows it away, and the protostar became visible as star.
PROTOSTAR
STAR
NG 6752RCW 38
END OF THE STAR LOW-MASS STAR
HIGHER-MASS STAR
MASSIVE STAR
The star converts hydrogen to helium. When hydrogen runs out, the outer layer expands and the core shrinks. It is now a red giant.
Low Mass Star Red
GiantPlanetary
NebulaEventually gravity can no longer contain the outer layers of the red giant and the star ejects these layers into space. The remaining carbon core is still very hot. It is called a planetary nebula.
White Dwarf
Black Dwarf
The cooling carbon core is all that is left. The remaining cooling core is called a white dwarf.
The core continues to cool down and eventually can no longer be seen. It is now called a black dwarf.
Higher-mass star
(from 1.5 – 3 times the mass of the sun)
1. Red Super Giant
the core collapses after the hydrogen burning phase the rapidly increased temperature leads to the fusion of helium very quickly.
2.Supernova
Supernova occurs when iron forms in the star’s core. After a star forms iron, it loses it’s internal energy source, the core collapse quickly under the force of gravity.
3. Neutron Star
During supernova, the collapse is so violent that the normal spaces inside atoms are eliminated, and a neutron star forms.
MASSIVE STAR RED SUPERGIANT
SUPERNOVA
BLACKHOLE
They are high mass stars that leave the "main sequence" when their core hydrogen is used up. They then develop into supergiant stars.vvv
Irons is form in the star’s core and it does not fuse. After a star forms iron, it loses its internal energy source, and the core collapses quickly under the force of the gravity. Then it explode.
Atomic forces that hold neutrons together are not strong enough to overcome so much mass in such a small volume. Gravity is too strong and the matter crushes into a black whole