kardashev-scale
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| SETI observed a Russian military satellite... |
|
0 | 141 | September 4, 2016 |
| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| SETI observed a Russian military satellite... |
|
0 | 141 | September 4, 2016 |