Activity for G. B. Robinsonâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Effects of the shadow of a city in the sky? If there was a city using antigrav to maintain a position over Kolkata, and it had approximately the area of New York City (roughly 300 square miles, or 780 square kilometers), what altitude would it have to hold to avoid detrimentally shading the land below? For reference, the city must be high enou... (more) |
— | almost 6 years ago |