Star life
What holds stars together
Gravity
What 3 things are stars classified by
SIze, Temperature, and Brightness
a cluster of stars, gas, and dust held together by gravity
Galaxy
tool used to plot stars based on their temperature and brightness
HR Diagram
Space hierarchy from largest to smallest
Universe, Galaxy, Solar System, Planet
What determines the age of a star
Mass
A stars brightness can be described in two ways
Apparent and Absolute magnitude
contains young stars, dust, and gas and takes no definite shape
Irregular Galaxy
the total amount of energy given off by a star, galaxy, or astronomical object.
Luminosity
What are the 3 main types of galaxies from youngest to oldest
Irregular, Spiral, Elliptical
Stars with less mass are the _____ stars
Younger
Brightness of a star as seen from Earth.
Apparent magnitude
flat, rotating disc with middle aged stars; our galaxy type.
Spiral Galaxy
a cloud of gas and dust where stars are born
Nebula
What do Irregular galaxies contain
Young stars and a lof of dust and gas
Stars with more mass are the ______ stars
Older
Brightness of a star as if it were 32.6 light years from Earth
Absolute magnitude
sphere shaped; contains billions of stars and have little gas and dust; contain only OLD stars.
Elliptical Galaxy
Place where stars spend most of their lives
Main Sequence
What do Spiral galaxies contain
Middle aged stars, dust and gas
The life cycle of a star starts at a
Stellar Nebula
Where are white dwarfs on an HR Diagram
Bottom left
Energy of gas held together by gravity
Star
A baby star
Protostar
What do Elliptical galaxies contain
Old stars and very little dust and gas