Stellar remnants
The largest stars in the Universe will end as
Black Holes
The three types of galaxies are spiral, elliptical and
irregular
The milky way is about ______________ light years across
100,000
The most important factor in determining the life cycle of a star is
mass
________ variable stars tend to pulsate at a certain rate and we know how bright they should be from this. We compare that to how bright they appear and estimate their distance.
Cepheid
Small and medium size stars will end as
white dwarfs
elliptical galaxies tend to have older stars and very few are the color ______
blue
The sun will orbit the galaxy in about _____________ years. This is called a galactic year.
250,000,000
Stars on the main sequence are fusing hydrogen into
helium
_________ Law states that the further away a galaxy is the faster it is moving away.
Hubbles
Big, but not the largest stars will end their lives as
neutron stars
active galaxies emit abnormally large amounts of energy from a tiny region in their _____
core
Stars in the milky way tend to form in the ________ _________.
spiral arms
The classification system of stars that starts with O
OBAFGKM
The center of a black hole is called the
singularity
After our sun burns through all of its hydrogen it will start to convert helium into
oxygen
The distance from the center of the galaxy to our solar system
26,000 light years
The flat part of the milky way is called the
disc
temperature of stars is indicated by
color
The distance from the singularity to the event horizon is called the
Schwarzchild radius
the largest stars will release all of their outer gases in an explosion called a
supernova
When a small galaxy is eaten by a larger galaxy it is called galactic
cannabalism
How do we know there is a massive black hole at the center of the galaxy.
orbit of stars there
in the bottom left corner of the HR diagram there are stars called
white dwarfs
the diagonal line from the top left of the HR diagram to the bottom right is called the
main sequence