Can't craft Rememberance..

[maestro]

I had the heart of the sun in my inventory. I visit an atlas station where I create a new star and I get recipe for star seed. I also see I can craft rememberance BUT the heart of the sun has just vanished from my inventory and now there are no more atlas stations I'm supposed to go to.

[Devilin Pixy]

When you finish the Atlas Path (birth a new star), the Heart of the Sun is consumed. When you finish the Purge (Artemis story), you get rewarded the recipe for Remembrance. All you have to do is craft the Heart of the Sun again to create Remembrance with it. This is quite a long sequence of crafts, creating all the Atlas Seeds again, starting with Captured Nanode, to finally make the Heart of the Sun again, just like you have been doing to finish the Atlas Path.
https://nomanssky.gamepedia.com/Atlas_Seed