Download CH29 The Life of a Star

THE STARS AND THE
GALAXIES IN THE UNIVERSE
THE SUN
THE STARS
THE GALAXIES
THE UNIVERSE
A POEM
THE SUN
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The Sun is the closest star to Earth and is the center of
our solar system. A giant, spinning ball of very hot gas,
the Sun is fueled by nuclear fusion reactions. The light
from the Sun heats our world and makes life possible.
The Sun is also an active star that displays sunspots,
solar flares, erupting prominences, and coronal mass
ejections. These phenomena impact our near-Earth
space environment and determine our "space weather."
CHARACTERISTIC
STRUCTURE
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Charateristics of the Sun
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Size:
1 392 000 km in diameter
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Mass:
1.98 x 10³° kg
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Density:
1400kg/m³
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Surface Temperature:5500 K
6000 K
THE SUN
STRUCTURE
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The Structure of Sun
THE SUN
CHARACTERISTIC
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The Stars
A Star is a big ball of hot gases. The
gases are mostly hydrogen and helium.
 A Star emits light and heat which are
generated by nuclear reactions.
 Stars vary in brightness. The brightness
affected by its distance from Earth.
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TYPES OF STARS
LIFE SPAN
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The Various Types of Stars
Stars are classify according to its size,
brightness, surface temperature and colour.
 There are four main groups of stars, namely
-White dwarf
-Neutron stars
-Giants
-Super Giants
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STARS
LIFE SPAN
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White Dwarf
TYPES OF STARS
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Neutron Stars
TYPES OF STARS
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Giant Star
TYPES OF STARS
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Supergiant Star
TYPES OF STARS
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The Formation of Stars
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Stars are formed within large clusters of dust
and gases called as nebulae.
Due to the force of gravity nebula collapses and
spin.
The spinning clouds pull in more hydrogen gas
over millions of years.
Collisions occurred between nebula and
hydrogen atoms.
Hydrogen atoms combine to form helium atoms,
releasing a large amount of heat and light.
THE DEATH OF
STAR
LIFE SPAN 1
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The Death of Stars
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The lifespan of Star is determined by the
original mass of the Star.
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The Star will become either a white dwarf,
neutron Star or black hole when it dies.
THE FORMATION OF STAR
LIFE SPAN 1
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THE DEATH OF STAR
LIFE SPAN 2
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THE GALAXIES
A Galaxy is a group of stars held together
by gravity.
 There are billions of stars in a Galaxy.
 The main three types of Galaxies are
- Spiral Galaxy
- Elliptical
- Irregular
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THE MILKY WAY
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Spiral Galaxy
GALAXY
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Elliptical Galaxy
GALAXY
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Irregular Galaxy
GALAXY
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The Milky Way
It is the name of Galaxy.
 It has spiral shape.
 It contains 200 billions stars.
 Sun is one of the star in Milky way.
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GALAXY
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THE UNIVERSE
The Universe contains billions of galaxies
with each galaxy containing billions of
stars.
 Universe is always evolving. Everything
that exits in the universe is not permenant.
New stars are being born while existing
stars will eventually die.
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A Poem For The Universe
Up the sky I share
I look up and wish I’m there,
Beautiful and rare
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