the stars and the galaxies in the universe 2 l
DESCRIPTION
This powerpoint slidesare from form 3 sallabus and it is about stars and galaxies. Students are allowed to view and upload their ideas of stars and galaxies.TRANSCRIPT
THE STARS AND THE GALAXIES IN THE UNIVERSE
THE SUN
THE STARS
THE GALAXIES
THE UNIVERSE
A POEM
THE SUN
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."
STRUCTURE MAIN MENUCHARACTERISTIC
Charateristics of the Sun
Size: 1 392 000 km in diameter
Mass: 1.98 x 10³° kg
Density: 1400kg/m³
Surface Temperature:5500 °C– 6000 °C
STRUCTURE MAIN MENUTHE SUN
The Structure of Sun
CHARACTERISTIC MAIN MENUTHE SUN
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.
LIFE SPAN MAIN MENUTYPES OF STARS
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
LIFE SPAN MAIN MENUSTARS
White Dwarf
MAIN MENUTYPES OF STARS
Neutron Stars
MAIN MENUTYPES OF STARS
Giant Star
MAIN MENUTYPES OF STARS
Supergiant Star
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The Formation of Stars
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.
LIFE SPAN 1 MAIN MENUTHE DEATH OF STAR
The Death of Stars
The lifespan of Star is determined by the original mass of the Star.
The Star will become either a white dwarf, neutron Star or black hole when it dies.
LIFE SPAN 1 MAIN MENUTHE FORMATION OF STAR
LIFE SPAN 2 MAIN MENUTHE DEATH OF STAR
LIFE SPAN 1 MAIN MENUTHE FORMATION OF
STAR
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
THE MILKY WAY MAIN MENU
Spiral Galaxy
GALAXY MAIN MENU
Elliptical Galaxy
GALAXY MAIN MENU
Irregular Galaxy
GALAXY MAIN MENU
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.
GALAXY MAIN MENU
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 shareI look up and wish I’m there,
Beautiful and rare
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