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P16 - Space (Formation (:earth_americas: (Gas driven away by heat (Gas…
P16 - Space
Formation
:earth_americas:
Gas driven away by heat
Gas giants
Rocks left
Rocky planets
Objects too small to be suns
Elements
Light
Star fusion
Heavy
Supernovae
Man-made by firing neutrons at uranium
Stars
Protostar - cloud of dust, gas & rock
Main sequence star - bright because of hydrogen fusion
Red supergiant - if bigger than the sun
:explode:
Neutron star - dense, neutrons only
Black hole - If large
Red giant - helium + light elements fuse -> heavier elements
White dwarf - star has collapsed, heated up
Black dwarf - has faded, gone cold
Orbits
Small body orbits large body
Gravitational attraction
Gravity from sun -> planet is towards sun's centre
Direction of velocity at right angle to gravitational direction