Stars Flashcards
What is the order of a star for a small scale star
Nebula, Protostar, Main sequence star, Red giant, White dwarf, black dwarf
What is the order of a star for a Large scale star
Nebula, Protostar, Main sequence star, Red super giant, Super nova, Blackhole/Neutron star
How does a nebula form a protostar
When enough gas and dust is pulled in it forms a protostar, which has an increase in pressure which results in a larger temperature, it is also bigger and has more grav
How does a protostar form a main sequence
This is where hydorgen nuclei form helium nuiclei (Nuclear fusion) and lots of energy which turns it into a MSS, which is perfectly balanced (like our sun)
How does a MSS turn into a red giant
When it runs out of hydrogen, fusion can not take place, which results in the MSS colapsing and then starting again to make heavier nuclei, resulting in a red giant
how does a red giant turn into a white dwarf/black dwarf
the red giant is unable and expels outer layers, as it does this a decrease in temperature and size happens resulting in a colour change, forming a white dwarf then a black dwarf
How does a MSS form a red super giant
When it runs out of hydrogen, fusion can not take place, which results in the MSS collapsing and then starting again to make heavier nuclei, resulting in a red super giant (Only happens for bigger stars due to their being more fusion)
How does a red super giant form a supernova then a blackhole/neutron star
the RSG explode forming a supernova, which then if it is big turns into a neutron star, but if its MASSIVE it will fall in on itself to form a black hole
What is red shift
When the wavelength increases and shifts towards the red end of the spectrum as the object moves away from us
What is the absoption spectra
All visible light seen of earth (ROYGBIV) (Long to short WL)
Why may distant galaxies have a different absorption spectra
redshift may cause the absoptioon spectra to shift, this is because they are moving away from us (Space is expanidng causing distance to grow)
What is the big bang theory
all matter was dense and small, till it exploded and keeps expanding till today (Becoming less dense)
Describe how light from distant galaxies shows that the Universe is still expanding.
Wavelength (of the light)
appears to increase
(Red shift/dopler effect)
What is the steady state theory
It suggests that even if the universe expands, the density of the universe will stay the same (new matter is constantly being created)
Who proposed the geocentric model
An astronomer named Eudoxus
