How to get all planets in my pocket galaxy express ?

Moon = Collide Astroids

Red Giant Sun = Collide Yellow Stars

Blue Giant = Collide Red Giants

White Dwarf = Collide Blue Gants

Blackhole = Collide White Dwarves

Worm Hole = Spin Black Hole (?)

Gas Giant = Collide stars to form nebula and orbit a rocky planet through it until Gas Giant forms

Ice Planet = Send a rocky planet flying through the galaxy

Now the individual planets were a thing for me...I didnt really notice how I unlocked them. But I am pretty sure it worked like this

Terrestrial Planet (TP) = Orbit an Icy Planet into the center of the Habitable Zone (HZ)

Swamp Planet = Ice Planet orbited into HZ. Ice melts and forms TP. Slam Fire Astroid into TP to heat up planet and lower water level. Hit TP with Ice Astroids to raise water level.

Alien Planet (AP) = I got that one by orbiting a TP around a Blue Giant just outside the HZ.

Desert Planet (DP) = I got this dude at the start menu upon a replay New Game. I think you Skate a TP on the inside edge of the HZ.

I am not sure how unlocking the planets of our solar system work at this time. I am still figuring that out. Hope this helped

Actually, to get alien planet, you have to create life on a planet, but before they make it into space, strike them with a large meteor, wiping then out.