The reason he went to the supermarket was to get some toothbrush and other travel items. He was ready to explore the solar system and walk around to see if he could find a suitable place to build a sandbox or develop some future development.
The reason why he didn't go before and only set off now was because his mechanical armor hadn't taken shape yet. They were all 600000 Rubik's Cubes, and they were as fragile as paper in a vacuum. They were instantly crushed!
However, three days had passed, and the mechanical armors were no longer the same as before.
