Getting there using a solar sail is the hardest part of the Helianthus ... More information: ASI Project Helianthus: Solar-Photon Sailcraft for Geostorm Early Warning: www.citytech.cuny.edu ...

It would sail the cosmic ocean ... These days we know just how much energy is in each packet of light, or photon. Although photons have absolutely no mass, they nevertheless carry momentum.

A single photon doesn't make much of a difference ... With the beam providing a source of constant pressure on the sail, the cumulative effect of this radiation pressure adds up to speeds ...

"According to monitoring data and calculations from the Beijing Aerospace Flight Control Center, the Chang’e-6 probe has accurately entered the target orbit as it unfolded its solar photon sail ...