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Chapter 11 - Coggle Diagram
Chapter 11
Star and Galaxies in the Universe(11.1)
Stars
Birth of a Star
A nebula's gases and dust particles are drawn together by a tremendous gravitational force, resulting in the formation of a globe.
The strong gravitational force causes the globe of gas to shrink and compress till it becomes very dense and forms a core.
The core shrinks and becomes dense due to the increasing strength of the gravitational force.
When the temperature and pressure in the core become too high,a nuclear reaction will take place. Hydrogen gas turns into helium.A huge amount of heat energy and light is released.
The core will shine and form a star known as a protostar
This new star continues expanding and either become an average star like the Sun or a massive sun
Death of a Star
In a star, a lot of heat is generated, which will heat the star's outermost layer. As a result, hydrogen within the layer starts to burn. This causes the star to expand. During this stage, the star appears red and is called a red giant.
If the red giant is not massive, the white dwarf is formed. If it’s big enough, it will contract so quickly that an explosion called Supernova will occur. Supernova is extremely bright, it will be seen in daylight.
After the explosion, a neutron is formed as long it’s larger than the original star. If the original star is a super-large star a black hole forms it is called so because no light can escape. Any matter that enters or gets sucked in can’t escape
Stars are formed by “Nebulae”. “Nebulae” are large clouds consisting of dust particles and gases such as “hydrogen and helium”
Galaxies
Irregular
Small Magellanic Cloud and Large Magellanic Cloud
Elliptical
Ursa Major and Messier 87
Spiral
Milky Way and Pinwheel Galaxy
A collection of bodies made up of millions of stars with gases, as well dust particles. Our galaxy is the “milky way” galaxy
Spiral galaxies, elliptical galaxies, and irregular galaxies are all various types of galaxies.
Earth's and the Universe's Relative Sizes(Comparison)(11.2)
Characteristics of Stars
Characteristics
Temperature :hotsprings::
Distance :left_right_arrow:
Size :
Brightness :bulb:
Color :rainbow::
Have you ever observed the night skies before when the stars are there? (I’m sure you have..at least once). If you looked very closely some stars are brighter and some are dim. Stars can be classified by the following characteristics:
Color Comparison
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Earth's and the Universe's Relative Sizes(Comparison)
This universe is very beautiful yet unique. There are millions of galaxies in the universe. The Milky way is one of the many galaxies in the universe. In the Milky Way, there is a solar system that consists of planets orbiting around the Sun.
The earth is as small as a bacterium in the universe. Picture how big the universe is…It’s big alright. In order for that, we need to appreciate the beauty of this Universe which is a symbol of God’s supremacy.
Image .