We know that
1 ly = 9.46 x ${{10}^{15}}$ m
Also, 1 Gm = ${{10}^{9}}$ m
1 ly = 9.46 x ${{10}^{15}}$ / ${{10}^{9}}$ = 9.46 x ${{10}^{6}}$ Gm
We know that
1 ly = 9.46 x ${{10}^{15}}$ m
Also, 1 Gm = ${{10}^{9}}$ m
1 ly = 9.46 x ${{10}^{15}}$ / ${{10}^{9}}$ = 9.46 x ${{10}^{6}}$ Gm