# How can I find the source of data of a wolfram alpha query?

If in Mathematica I type, for example:

==Sun mass


Wolfram Alpha gives me lots of data (mass in kg, lb, sun radius, temperature...):

but where do they come from? How can I find the source of the data?

• You can use StarData["Sun", "Mass", "Source"] in the notebook, which does list some sources. I know that for other stars, mass is a computed property, but I don't know if this holds for the Sun as well. – Jason B. Aug 26 '16 at 15:53