Space Prints

[ClayMask]

I'm finishing my collection of space prints, and I can't find any lists of how to obtain each of them (whether it's by using the observatory during the day to look at the sky, or at night to search for the truth or stargaze).  Does anyone remember specifically how to get the End of Time and T-Rex Nebula prints?

[Nutella]

Those two are both observe the sky (day).  The 3 special ones (focused, night, search for truth) are Battle Stars, Surfacing, and Cloudy Vision.

[ClayMask]

I just found them both using stargaze, at night.  I hadn't had any luck with finding them that way earlier during the day, but it sounds like they can be found either way.