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P7 (big bang theory vs steady state theory, satellites, planets in our…
P7
big bang theory vs steady state theory
big bang theory- same amount of matter as the universe expands
steady state theory- more matter is created as the universe expands
more evidence to support the big bang theory
satellites
natural- the moon is an example of a natural satellite which orbits the earth.
a satellite is something which orbits
artificial- the international space station
planets in our system
Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
my very excited mum just served us noodles
theories on the structure of our solar system
Geocentric model- suggested by ptolemy and believed the earth was at the centre of the solar system
heliocentric model- suggested by copernicus and believed the sun was at the centre of the solar system
asteroids
made of metal and rock
usually found between Mars and Jupiter
comets
made of ice
can be seen by the naked eye
life cycle of stars
stars begin as nebula (cloud of dust and gas). they then become a main sequence star. the star then develops depending on its size. they then become a red giant star and then a white dwarf if they weigh less than the sun.
stars begin as nebula (cloud of dust and gas). they then become a main sequence star. the star then becomes a red giant superstar. it then becomes a supernova and develops into a black hole or neutron star.
weight
weight differs on different bodies in space as weight = mass x gfs. so you would weigh more on a planet with a stronger gfs.
dwarf planet
it is considered a dwarf planet as it doesn't have a strong enough gravitational pull to be able to clear the area around it.
