astronomy assesment 2 Flashcards
(22 cards)
hottest colour of fire
blue
how a star maintains its lifecycle
starts with smashing H atoms together until they form He, then just continue until they’ve gotten larger and larger and then end
how an atom becomes excited
some electrons go up an energy level
how lines appear in wavelengths
a hot object passes through gas, absorbs some
how to figure out unknown substances
look at the lines present for things having interacted with other gasses, if it matches, it’s that one
things competing inside a star
inward force - gravity
outward force - colliding particles and fusion reactions
stages of an average star
stellar nebula, average star, red giant,planetary nebula, white dwarf
stages of massive star
stellar nebula, massive star, red supergiant, super nova, blackhole/neutron star
stellar nebula
gravity pulls together H atoms until 10 million degrees, fusion begins
average star
energy released from fusion balenced by gravity, stable and in main sequence
red giant
when average star runs out of fuel, explands and cools
planetary nebula
outer layers are blown away
white dwarf
left over core, no fusion, light remaning is from left over energy
massive star
fusion is actively happening, large elements, runs out of fuel faster
red supergiant
star expands and cools as it runs out of fuel
supernova
massive explosion while collapsing
blackhole
collapsed core of particularly large stars – so dense, much gravity, no such escaping light
neutron star
very dense dead star
what decides dwarf, black hole, neutron star
mass
mass for black hole
> 28Msun
mass for neutron star
10-24Msun
mass for white dwarf
<10Msun
