astrophysics Flashcards
whats a universe
a large collection of billions of galaxy’s
whats a galaxy
large collection of billions of stars
what galaxy contains our solar systems
the milky way
what does the gravitational field strength around an object depend on
the mass of the object and the distance from the object
what are comets
huge balls of grit and ice
what do moons orbit
moons orbits planets
what do planets orbit
planets orbit the sun
what do artificial satellites orbit
artificial satellites orbit the earth
what to comets orbit
comets orbit the sun
artificial satellites can be used to do what
send information to places far away
monitors weather, forest fires etc
observe universe without the earths atmosphere distorting the image
what shapes of orbit are moons comets and moons
elliptical
what are the stages of the evolution of the stars
nebula
star main sequence
red giant
white dwarf
what is a nebula
large gas cloud and small pieces of dust
nuclear reactions take place and a protostar is formed
what is the main sequence star
a star will spend around 90% of its lifetime as a main sequence star
90%of the universe is sequence stars
star that is fusing hydrogen in its core
if the temperature is between 50000-28000. what is the colour if you wanted to find out about what star it is?
blue
if the temperature was between 28000-10000.what is the colour if you wanted to find out about what star it is?
blue-white
if the temperature is between 10000-7500.what is the colour if you wanted to find out about what star it is?
white
if the temperature is between 7500-6000.what is the colour if you wanted to find out about what star it is?
white yellow
if the temperature is between 6000-4900. what is the colour if you wanted to find out about what star it is?
yellow
if the temperature is between 4900-3500. what is the colour if you wanted to find out about what star it is?
orange
if the temperature is between 3500-2000. what is the colour if you wanted to find out about what star it is?
red
what is the evolution the stars with a nebula less than 4 times heavier than our sun?
nebula of mass
main sequence star
red giant
white dwarf
what is the evolution of stars with a nebula more than 4 times heavier than our sun? (but less than 25 times heavier)
nebula of mass main sequence star red giant/red supergiant supernova neutron star
what is the evolution of stars with a nebula more than 25 times heavier than our sun?
nebula of mass main sequence star red supergiant supernova black hole
what is a red giant?
star expands as hydrogen fuel runs out, outer layer cools and is no longer white or yellow, but hot red.
what is a white dwarf?
star shrinks until it is very small and dense, shining with a white light.
