Subject: Three astronomy questions--relative difference between a solar system...

Would you please answer these questions for me

1)   I am trying to get an understanding of the relative difference between 
a
solar system,  to whatever--a constellation?, to a galaxy, to what?--a
universe?
I was taught that a constellation is composed of two or more solar systems
that have a common center.  Is that true?

2)   Our solar system has the sun as its center.  What is the name of the
next larger center of which our Earth is a part?

3)   If the Milky Way galaxy has a center then what is the name of the 
center
and what is the name of the center around which our universe revolves?  
What
is larger than the universe?  Is it cosmos?

Thank you for your help!
jwb

Re: Three astronomy questions--relative difference between a solar system...