The process by which a star changed over the course of time.

The main trigger of star formation is a shock wave from a catastrophic explosion of a nearby star known as this

During this stage, gravitational contraction continues and this collapse causes the core of the developing star to heat much faster than its outer envelope

Low mass stars less than this fraction of the mass of the sun consume their fuel at relatively low rates

These two astronomers created the diagram

Early stars that are massive; they often had short lifetimes

Once the cloud collapses, potential energy turns into this type of energy

During this stage, stars experience minimal changes in size or energy output

This type of star exceeds 8 solar masses and have relatively short life spans and terminate in brilliant explosions called supernovas

The diagram can be used to learn about the relationships among sizes, colors, and this

The diagram that displays stellar evolution

The birthplace of stars are in this type of cloud

The average star spends 90 percent of its life at this star stage

Medium-mass stars collapse from red giants to white dwarfs then to this

Each star is plotted based on its temperature and this

The first star is estimated to have formed 300 million years after this theory

Red objects that are no hot enough to engage in nuclear fusion, they are not yet stars.

the evolution of this stage begins when the usable hydrogen in the star’s interior is consumed, the core then collapses on itself and the internal temperature rises, which causes the star to expand

These stars are sun-like

These stars appear in decreasing order, from hotter, more massive blue stars to cooler, less massive red stars

First generation stars are made up of these two elements

When the temperature of these gaseous bodies increases sufficiently they begin to radiate energy in the form of this

The most massive stars become this

Low-mass stars remain stable main-sequence stars until they consume their usable hydrogen energy fuel and collapse into hot, dense these

The diagram was created in this century