0_Apprentice
I love looking at stars at night.  Do you think we'll ever visit one some day?
1_Wizard
Maybe some day I suppose, We all know that the closest star to Earth is the Sun and NASA has sent some probes there recently to actually land on it, I'm not sure if thats feasible. 
0_Apprentice
Oh the sun is a star?  So what is a star exactly?
1_Wizard
A star is defined as a type of astronomical object consisting of a bright luminous spheroid of plasma held together by its own gravitational field. 
0_Apprentice
Oh wow, so does a star have a lot of gravity?  Do other things orbit other stars?
1_Wizard
Well of course many things orbit a star like planets moons and asteroids. 