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The universe and the solar system (Celestial bodies (Planets and dwarf …
The universe and the solar system
Celestial bodies
Stars
They are born from a huge cloud called a stellar nebula.The nebula contracts under its own gravity and forms a protostar.
Planets and dwarf planets
They do not emit light
They haven't satellites
They are spherical in most cases
They have their own orbit but the dwarf share one with other celestial bodies.
They have two basic movements
Rotation :night_with_stars:: :sunny:
1 day
Time tha the earth needs to rotate 360º on a imaginary axis
Revolution :sunflower: :fallen_leaf: :snowflake: :sunny:
1 year
Time that the earth needs to revolve around the star
Satellites
Asteroids
Comets
Meteroids
The universe
origin
Big Bang Theory :explode:
The universe was created 13700 million years ago
It was created as a result of a massive explosion called the Big Bang
space and everything that exists in it
Galaxies
enormous group of stars,dust and gases held together by the force of gravity.
they are classify by their shape
They are not isolated ,they form clusters and it forms superclusters
Clusters(group of a few galaxies)
Superclusters(group of clusters)
They change and evolve with the time
The milky way
Asteroids
Stars
Comets
Planets
The light-year :stars:
It's equal to the distance that light travels in one year.
Light travels at a speed of 300000 km per second
In 1 year,light travels around 9460000 million km
A historical view of the earth's position
Geocentrical theory
The geocentric model was developed by
Aristotle
(384–322 BC)
modified by
Claudius Ptolemy
(ca 85–165)
Heliocentrical theory
Aristarchus of Samos
(310–230 BC) was the first astronomer to suggest that the Sun was the centre of the Universe.
In the sixteenth century,
Nicolaus Copernicus
(1473–1543) studied and developed the heliocentric model (helio is the Greek word for ‘Sun’).
The solar system
Is a group of planets and other celestial bodies witch orbit a star.
Our solar system was created approximately 4600 million years ago from sn inmense cloud of gas and dust.
Planets in our solar system
Gas planets
Saturn
Uranus
Jupiter
Neptune
Big in sice,mainly composed of gases and ice and they are far away from the sun
Rocky planets
Venus
Earth
Why is life on earth possible?
Distance from the Sun
Perfect amount of heat and light
suitable climate(balance between cold and cold)
Liquid water
(most important chemical substance in life)
Atmosphere
Breathable atmosphere
oxygen (respiration) an carbon dioxide (photosynthesis)
Protect us by blocking out dangerous rays of the Sun/ burning meteoroids
Size
gravitational force make posible to retain the atmosphere
Mercury
Mars
Small in sice, mainly composed of rocks and metal and they are near to the sun