You have given very little detail about how your data are stored. There are a few possible ways, depending on that.
% Pretend data for the planet & sun locations:
xyz = [0 0 0; rand(8,3)]; % Sorry, Pluto
% Plot them
figure
plot3(xyz(:,1),xyz(:,2),xyz(:,3),'.','MarkerSize',24)
You could also used scatter3 instead of plot3.
