How far are we from these milestones/technologies?

[Chris Riccard]

It's entirely possible to seed a planet, matter of fact NASA should already have looked into that and I'm sure they have. All you need is a class m planet with water and a favorable temperature and a sun. Freeze dried bacteria should work just fine.

 

[Vanadium 50]

. All you need is a class m planet

That's fiction.

 

[bhusebye]

If you were going to seed a planet I would send the organism Prochlorococcus. Could be a tablespoon of critters. I am sure they freeze well.