| ▲ | mike_hearn 4 hours ago | |
The cost of "launching" mass on Earth is not zero, though. | ||
| ▲ | monooso 3 hours ago | parent [-] | |
I didn't suggest that it was. | ||
| ▲ | mike_hearn 4 hours ago | |
The cost of "launching" mass on Earth is not zero, though. | ||
| ▲ | monooso 3 hours ago | parent [-] | |
I didn't suggest that it was. | ||