3 ms·
Why not use a passive solar heliograph, e.g. a spinning cubic or dodecahedron mirror? That should last for a million years or more.
by dr_dshiv 6y ago
Why not use a passive solar heliograph, e.g. a spinning cubic or dodecahedron mirror? That should last for a million years or more.
- me_me_me 6y agoAt that stage you are having different considerations. And first contact is probably less scary if you can build mega structures in the orbit. Vanity mega structures if its sole purpose is to announce your presence to the universe.