Data in various formats are everywhere, and the need to be able to analyze them is obvious. Although there are many useful tools for manipulating and analyzing data, it is very difficult to ensure inter-operation between the tools to be able to use the whole range of their capabilities. Data galaxies is a new concept that is intended to provide a common space for different kinds of data manipulations and visualizations, where existing tools can be used together in a data flow leading to the desired result. The power of the approach is demonstrated by several use cases. Implementation details are also provided.