the planets in the solar system go in the order Mercury Venus Earth Mars Jupiter Saturn Uranus
the asteroid belt is in between Mars and Jupiter
Jupiter has 16 moons
Saturn has rings made out of rock and dust
Pluto is a dwarf planet
gravity between two planets depends on the mass of the planets and their seperation
weight = mass x gravitational strength
the seasons variate throughout the year from Earth being tilted on its axis
daylight hours , temperature , suns height in sky at midday are all affected by the Earths axis
Earth tilted towards the sun --> summer
equinox --> 12 hours day and night
lightyear is the distance travelled by light per year
a nebula is a huge cloud of hydrogen gas and dust
a protostar is when a nebula has collected into a sphere
a main sequence star is a star that has started nuclear fusion
a red giant is the size of the sun
a red super giant is a high mass star
a red giant turns into a white dwarf then a black dwarf
a red supergiant explodes in a supernova explosion
a supernova turns into a neutron star or a black hole
the bigger a star is the hotter it's core , hydrogen turns to helium faster , heavier nucleii can be formed by fusion , less tume is spent as a main sequence star