Once planets leave the "recently scanned" sort, it's hard to keep track of them. After a scan blitz, I occupied 4 planets at once and had to write them down so I could find them.

Having a sort by date option would be nice. Either date scanned or date occupied, either one would work.

+1 Date occupied

Edit: while we're at it, can we get a Development Stage column in the planets listing? Pretty prz?

it could be sort by colony age, with displaying the age it the list.
This would allow you to see the development stage by the age.

0 day(s) = New
1 day(s) = Emerging
2 day(s) = Developing
3 day(s) = Maturing
4 day(s) = Peaking
5+ day(s) = Peaked