ACME: Neil and I met almost 40 years ago in a galaxy far far away and have been friends for a long long time. We had already discussed doing a puzzle together when Will broached the idea of pairing a megastar (pun intended!) with a mere mortal.

Neil participated in every aspect, from theme generation to input on fill and cluing, despite his very tight schedule ... he really is in another stratosphere these days!

(The original theme seed was YOUCANTBESIRIUS (15!), followed by PLANETOFTHEAPUS, a bird-of-paradise constellation no one has ever heard of!)

Neil and I went through dozens of astropuns and Will and Joel were the final arbiters, even adding LITTLEDIPPER. They were strict about getting us to tighten our focus on stars, specifically. Smooth sailing, despite a little "discussion" as to whether HEAVENLYBODY clued as a "hottie" was sexist or not ... and my stubbornness of wanting DWARFPLANET ("Where Doc and Dopey hail from?") as a poke at Neil, who was responsible for demoting PLUTO, much to the horror of third graders everywhere.

Neil is an energetic, indefatigable, humorous, brilliant educator who wants to highlight Science in many forms ... whether hosting "Cosmos" or joining forces with his old college buddy to create a little Monday puzzle!

NEIL: I suppose a good puzzle clue is one where some people know the answer outright, while other people know they should know the answer but don't, leaving the rest to feel guilty for being clueless about the clue itself. Of course, politics, literature, entertainment, and pop culture, combined with nimble vocabulary, heavily feed these puzzles.

But as science rises in or culture, empowering us to become better shepherds of this world that we are borrowing from our descendants, we might expect to see science-inspired clues alongside the traditional ones. And maybe even occasional puzzle that's entirely science themed. In this spirit, I was delighted to work with one of the NYT's frequent contributors Andrea Carla Michaels, an old acquaintance from college, to bring some of the universe down to Earth — in this case, for a Monday Puzzle. As good a place as any to start.

Neil deGrasse Tyson! Fanboy SQUEEEE! (Sorry for breaking your eardrums.)

Huge fan of Tyson's — Jill and I watched all of his "Cosmos" remakes. In a time when science gets dismissed by all too many people, I love Tyson's efforts to educate and make change with humor. What a pleasure to get an amusing astronomy theme from him and Acme.

I had heard HEAVENLY BODIES before, in this [Total hottie?] sense, but the others felt fairly fresh. I particularly liked the more esoteric terms like STAR CLUSTER and GAS GIANT, showing off Tyson's depth in astronomy.

Did you understand the clue for RED DWARF? [Bashful?] refers to Bashful, one of the Seven Dwarfs — the one who frequently turns red. Concise, amusing, spot-on. Perfect!

There were a few rough aspects to the grid — the north, in particular, felt clunky. AIRE (suffix), ITSA (partial), AS BIG (quasi-partial) all in one area is not good. Adding a cheater square up there, perhaps at the A of AIRE, might have helped, while still allowing for PAYPAL. The overlap of LITTLE DIPPER and GAS GIANT does make things slightly tricky, but a section that unconstrained ought to be smoother, especially when it's so close to where most solvers start a puzzle.

At 80 words, this is over Will's usual max of 78. I don't mind that, if I get some nice bonuses in the fill. But aside from PAYPAL, there was only PUMICE, TWEETS, PSYCHO that added to the quality of my solve — not enough for my taste. No doubt that the grid construction is challenging, especially with five themers and a central 11-letter entry splitting up the puzzle, but I would have liked to see what happened if the three black squares after KNEAD were removed, allowing for a long down answer where AFAR and HOOVES are right now. Would have required moving around a ton of black squares, but even getting a single pair of great bonus entries can add so much.

That all said, when a theme shines, I don't mind grid flaws nearly as much. So happy to get this concept that's so appropriate to Tyson. Well done to Acme for bringing him into the NYT constructors' fold!