| SETI's question |
| Furtive question |
| Question for SETI |
| Is it safe to talk? |
| Exobiologist's query |
| Can anybody hear us? |
| 'Is anyone else here?' |
| A question of cosmology |
| What cosmologists wonder |
| What many stargazers wonder |
| Spy's query at the start of a meeting |
| Conspirator's cautious conversation starter |
| Central question in the search for extraterrestrial life |