X360dock Module 2 and Module 1 differ much

X360dock module 1 = X360dock board =Playing games from PC/Laptop

X360dock module 2 = X360dock board+Touch screen remote=Playing games from external hdd

x360dock module 1 + Touch Screen Remote = X360dock Module 2.

With X360dock module 2 , you can play games from your external hdd, you dont need the pc or laptop any more.

nope - neither has any relevance to astronomy