Activity for Ãtalo Lessa
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Can there be a planet with no dust? What restrictions this planet must have to make it possible? Planet can have any size, be made of any material A human must be able to land in it and observe it, dust added to the planet from the human's clothes or equipment may compromise the no-dust characteristic of the planet but it must be dus... (more) |
— | almost 8 years ago |