Navigation In Space

1. What is a Solar System? What is the Milky Way an example of?
The differences between the universe, galaxies, and solar systems are at the heart of the science known as astronomy.
What is a Star? Describe a Nebula.
Stars are something that shines in the sky above us and also forms from Nebula. A nebula is a giant cloud of dust and gas in space when a star explodes it turns into Nebula.
How do Stars die?
It takes millions of years for it to die. So this is how it can die it when its fuel runs out then it turns into a red giant.... after puffing of it layers of the star collapses to form a very dense white dwarf.
Is there an up or down in space? 
In space there, No up or down in space. That can mess our heads and make us go crazy and can also affect the way people think in space.
How can Stars be used to Navigate? 
For people or sailor is a step from the dead reckoning.