Star Formation
All stars are formed from this type of celestial object.
What is a gas cloud?
Unlike Main Sequence stars, Protostars are not in this state.
What is Hydrostatic Equilibrium?
The name of the stage of stellar evolution stars are in when they are at the bottom left of the HR Diagram.
What is a White Dwarf star?
This kind of Nebula is reddish in color.
What is an Emission Nebula?
This event occurs when a white dwarf in a binary system exceeds 1.4 times the mass of the sun.
What is a Type I Supernova?
The process of gravity breaking down a gas cloud into smaller pieces.
What is fragmentation?
Stars that have a similar mass to Earth's sun cannot burn this element.
What is Carbon?
Stars spend 90% of their lifetime on this region on the HR Diagram.
What is the Main sequence star?
This kind of Nebula is bluish in color.
What is a Reflection Nebula?
In a binary system, this event occurs when Hydrogen dumped on the surface of a white dwarf explodes but does NOT destroy the star.
What is a Nova?
This phase of stellar evolution has stars too cool to be be found on the HR diagram.
What are Protostars?
The name of the stage after the Planetary Nebula Stage where a Carbon core remains.
What is a White Dwarf?
The mass of a star can be determined on its location on this part of the HR Diagram.
What is the Main sequence?
This kind of Nebula obscures the stars behind it.
What is a Dark Nebula?
This event occurs when an iron core of a massive star exceeds 1.4 times the mass of the sun.
What is a Type II Supernova?
This stage of stellar evolution occurs right after the Protostar phase.
What is a Zero age main sequence star?
These two stages of stellar evolution have no nuclear burning/fusion.
What are Protostars or Subgiant Branch stars?
Blue Giant stars are found in this part of the HR diagram.
What is the Top Left?
The Horsehead Nebula is an example of this kind of Nebula.
What is a Dark Nebula?
The mass of an iron core and a white dwarf not exceed this value.
What is 1.4 solar masses?
This temperature is when a Protostar be classified as a full star.
What is 10 million Kelvin?
This are the power sources for a Horizontal Giant Branch star.
What are Hydrogen shell burning and Helium core burning?
This later stage of stellar evolution makes a vertical line on the HR diagram.
What is the Asymptotic giant branch?
A Reflection Nebula is caused by this.
What are Dust particles reflecting blue light?
This type of star is what remains after a Type II Supernova.
What is a Neutron Star (or pulsar)?