Stars-- birth and death

Introduction

What is a star?

Do stars last forever?

Where did the first stars come from?

Focus on: the long lives of stars

Where are stars born?

Are there different kinds of nebulae?

Focus on: nebulae: clouds of the cosmos

How does a star begin to form?

What is a protostar?

How does a protostar become a true star?

What is a main-sequence star?

Do all stars have planets?

What is a brown dwarf?

How does a star die?

What is a red giant?

What is a white dwarf?

What will eventually happen to the sun?

Focus on: twilight of the titans

What is a supernova?

What events lead to a supernova?

Why are supernovae essential to life?

Focus on: supernovae: cosmic fireworks

What is a neutron star?

What is a pulsar?

What is a black hole?

What is a star cluster?

What is a galaxy?