The Sun
The layer of the Sun's atmosphere that gives off visible light
What is the photosphere?
Temperature of a yellow star compared to a blue star
What is cooler?
The H in HR Diagram
Who is Hertzsprung?
The initial stage in the life cycle of stars.
What is a stellar nebula?
The outermost layer of the Sun's interior
What is the chromosphere?
The most common element in the Sun
What is hydrogen?
What is luminosity?
The x-axis on an HR diagram
What is temperature?
The event that begins a stars expansion into a giant from a main sequence.
What is running out of Hydrogen for fusion?
The process by which energy is created in the stars
What is nuclear fusion?
The hottest part of the Sun
What is the core?
The hottest color of a star
What is blue?
The R in HR Diagram
Who is Russell?
The defining characteristic of a main sequence star
What is fusion of hydrogen? (into helium)
The layer of the Sun's interior where energy is transferred mainly by electromagnetic radiation.
What is the radiation zone?
The layer of the Sun's atmosphere that looks like a halo during an eclipse.
What is the corona?
The reason blue main sequence stars have shorter lives than red main sequence stars
What is blue stars are hotter and use their fuel faster?
The region that 90% of stars on the HR diagram fall into.
What is the Main Sequence?
The theoretical end for an average mass star
What is a black dwarf?
Areas of gas on the Sun's surface that are cooler than the gases around them
What are sunspots?
reddish loops of gas that link parts of sunspot regions
What is a prominence?
A star that did not have enough mass to start fusion of Hydrogen into Helium
The lower left region of the HR Diagram
What are white dwarfs?
The event that leads to the formation of a neutron star or black hole depending on mass for a red supergiant star.
O, B, A, F, G, K, M
What are the spectral classes?