ability to mentally manipulate the energy generated by stars as well as their electromagnetic, gravitational, radiation and cosmic energies
Method 1 (unconfirmed)
absorbing from closest star(the sun) by using our body natural ability to absorb solar energy and amplifying it with psi concentrate on the feeling to become more proficient in it.
And you can also try to use the absorbed energy to improve your psionics directly
Method 2 (unconfirmed)