Vocabulary
What is Luminosity?
It refers to the brightness of the star or the amount of light that the star radiates.
What system do we use to classify different stars?
Stars are classified under the Morgan-Keenan(MK) system.
What kind of star is our sun classified as?
A Main Sequence star.
What is the early life stage for a star?
A Prostar.
In a high mass life cycle what is the big explosion that occurs?
A supernova.
What is the definition of Surface Temperature?
The temperature at or near the surface of the star. The color of the star also tells its temperature.
What letters are used in the MK system of classification?
O, B, A, F, G, K, and M
O being the hottest and M being the coolest
What is a Neutron Star?
Neutron Stars are the smallest known stars which emit(give off) radio waves.
How is A star formed?
A collapsing cloud of nebula dust which forms it then nuclear fission happens and creates a core for the star.
What's the biggest star in the universe?
UY Scuti, this star is 1,700 times bigger than our star.
What is Apparent brightness?
It is the object's brightness as seen from a certain distance.
Who created the Hertzsprung-Russel(HR) Diagram?
The diagram was created by Ejnar Hertzsprung and Henry Norris Russell.
What is a white dwarf?
An old core remains from a star which burns the last of its fuel before it burns out
What determines the rest of a star's life after main sequence?
The amount of mass a star has.
How does a Planetary nebula form?
A Planetary Nebula forms when a star dies it sheds its outer layers into a colourful cloud.
What is Spectroscopy?
A science that deals with the study of the spectral lines produced by the electromagnetic radiation of stars as it passes through a diffraction grating.
What relationship does the H-R diagram show?
Shows the relationship between surface temperature and absolute brightness.
What is a Black Dwarf Star?
A Black Dwarf is a white dwarf that ran out of energy and became faded.
What are the two last options at the end of a high mass star life cycle?
1. If the star is high mass it turns to a neutron star.
2. If the star is super high mass it turns to a black hole.
What are the radio waves Neutron Stars emit?
They are known as Pulsars.
Whats an H-R Diagram?
The H-R diagram shows the relationship between the surface temperature and the luminosity of stars.
What is the colour of the hottest stars to the coolest stars?
Coolest stars are red and hottest stars are blue.
What is a Red Giant star?
A Red Giant Star is the next evolution after a main sequence which the star becomes way bigger and extremely hotter.
What is at the end of a low-medium mass star life cycle?
A white dwarf which after time turns to a black dwarf.
What is the sun on the H-R diagram?
The sun is a G-type main-sequence star