I get it now

[Tecmage]

So in the last two weeks I have built three buildings that gift collection items. I had the Alien Legacy statues, but having buildings that gift other collection items is nice. I understand now why some players have a lot of these buildings.

 

[Robby Kusuma]

Try space monument, space garden. Buy Training Center, Academy and Planetarium. Use golden dice when you tap or harvest the buildings. The drop will be wow. During visit, use golden dice and tap planetariums. To support, buy Casino and friends. It is all one circle to do a lot of launches.

 

[Bali Hi]

When Alien Legacy was first available, it gives 20 space items every 24 hours!! Now, it only gives 1 item .
And you only need to complete 1 collection to get an Alien Legacy back then (versus 3 collections now).
Of course back then space launches was much harder and require more effort (no QL parties).

Tip: Alien Legacy does not require roads, so you can put them at "blank spots" or at the edges of the residential area.

Your next step is to do green & blue launches to collect more items for Space Station x3 to get the "Space Travel Monument". Join QL parties when you can.