Hey,
During Beam Struggles, the involved energy blasts only ever explode (
1) when matched with an equal force (
1)(
2).
Otherwise, the weaker attack is reflected (
1)(
2)(
3), envelops the loser of the clash (
1)(
2)(
3), and proceeds forward (
1), even escaping into space (
1)(
2)(
3).
Judging by the direction of the Z-Fighters's shadows in
chapter 221, pg. 2 (their shadows extend by their right side),
chapter 221, pg. 10 establishes that the Sun,—which shadows protrude in the opposite direction of, being their primary light source,—is to Piccolo's left. Cell is on Piccolo's left.
The blast could have potentially extended outward beyond Earth and exploded atop Mars (
2.4328063 KiloFOE) or even Neptune (
954.010922 KiloFOE).