Lunar Sig­nals – Per­ma­nent Shadow
Ice, dark­ness, and the first time the sequence goes to a crater that nev­er sees the Sun.

From the Fab­u­lae Lunae series — The Luna­dyne Inci­dent, Thun­der Moon Tus­sle, and Mask of the Joy­ful Moon.

Thurs­day live on Torn MacAlester’s Space on X.

Sched­uled: Lunar Sig­nals – Per­ma­nent Shad­ow / X (@i) on X

Torn MacAlester’s Space · Where live audio con­ver­sa­tions happen

Tonight’s Topic

Per­ma­nent Shadow

Mon­day this week is straw-cups: a small hard­ware les­son at one-sixth g. Tonight is the oth­er end of the same physics. Con­rad sits on the equa­to­r­i­al belt, in Oceanus Pro­cel­larum, under a Sun that ris­es and sets on a two-week clock. The ice is not there. The ice is in the dark.

In Descent into Dark­ness, Nils Carmike is not yet the man telling tourist sto­ries for a tab. He is a rep­ri­mand­ed astro­naut who stud­ied PSR ice retrieval, picked by com­man­der Mose because the Astro­naut Office guar­an­tee still holds: what I say goes. Includ­ing crew. The tar­get is a per­ma­nent shad­owed region — a crater floor that nev­er sees the Sun, cold enough that Mose, look­ing down into Shack­le­ton, has to say it out loud: cold­er than Plu­to, and still close enough to Texas that the com­par­i­son feels wrong.

A robot rover already went down. It failed to return a core. It is still down there. The back room wants three EVAs. Var­gas wants the rover. Mose cuts it: the mis­sion is the core sam­ple. Go after the rover and you may not get a core. Nils splits the dif­fer­ence the way a man who has already lost one Moon flight splits dif­fer­ences — land near the rover, take a core, hook up, dri­ve out. Polar light­ing, polar ther­mal, polar comms. None of it is the belt they already know.

They land. Hous­ton gives them a sta­ble six hours. Nils looks out at a rough cir­cle of light around the rim and a floor black­er than the stars. The lan­der’s own shad­ow runs a hun­dred meters toward the dark. He calls it the mouth of Hell after he checks that the micro­phones are not on VOX.

The sto­ry stops on the rim, with the work still below them. That is the dis­cus­sion. Not the mon­tage. The first time the Fab­u­lae Lunae sequence goes into a crater that nev­er sees the Sun, and what you are will­ing to spend before you build a sta­tion on the answer.

Con­rad still lives on recy­cling, rationing, and argu­ment. Under Tsi­olkovsky, water is eas­i­ly half the con­sum­able mass a per­son requires. A gal­lon a day that does not have to be shipped changes the logis­tics of stay­ing. Fail to sam­ple the dark, and every radi­a­tion shel­ter and pow­er farm at the pole is a bet you have not earned. The real ice detec­tions Nils will one day dress up as some­one else’s lunch­box sit down­stream of that first look.

Questions for the Room

• If the core is the mis­sion and the rover is already lost, which one do you spend peo­ple on — and who gets to decide when Earth is three days away?
• Mose is sev­en­ty-one and still fly­ing. Nils has a rep­ri­mand and a polar spe­cial­ty. Is “what I say goes” how you want a first descent into per­ma­nent shad­ow run?
• Con­rad still lives on import­ed mar­gins. How much of the lat­er fron­tier — claims, cold traps, cor­po­rate ice — is down­stream of a crater that nev­er sees the Sun?
• Nils names the floor the mouth of Hell with the VOX off. What do you call a place that is cold­er than Plu­to and still a logis­tics prob­lem for Texas?

How to Join

Join the con­ver­sa­tion on Torn MacAlester’s Space on X. Check @Torn_MacAlester for the live link.

Fur­ther Reading

• The Luna­dyne Inci­dent and Oth­er Sto­ries — “Descent into Darkness”
• Fron­tier Foun­da­tions – Dark Craters
• Thun­der Moon Tussle
• Mask of the Joy­ful Moon
• Relat­ed site posts: Nils Carmike, The Water Econ­o­my, EVA Real­i­ty

The Joy­ful Moon is still watching…
and some shad­ows still hold water.

— Torn MacAlester
Still rid­ing the trails with Nils, Gen, and the whole Fab­u­lae Lunae crew
🚀🌕

Stories The sto­ries of Torn MacAlester are sci­ence fic­tion, where the sci­ence is well-ground­ed. I inten­tion­al­ly made any devi­a­tions for spec­u­la­tive pur­pos­es. To main­tain max­i­mum real­ism, I restrict the scope of these deviations. Read More

Articles I write arti­cles of sci­ence fact and sci­ence fic­tion. The arti­cles here span the knowl­edge of mod­ern sci­ence and the spec­u­la­tions of fic­tion. I try to caveat every­thing that is an assump­tion. You will find arti­cles about space­flight, the pos­si­bil­i­ties of alien con­tact, and descrip­tions of tech­nol­o­gy used in my stories. Read More

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