Month: May 2024

Enlarge / Galaxy rotation has long perplexed scientists. (credit: NASA/James Webb Telescope)

One of the biggest mysteries in astrophysics today is that the forces in galaxies do not seem to add up. Galaxies rotate much faster than predicted by applying Newton’s law of gravity to their visible matter, despite those laws working well everywhere in the Solar System.

To prevent galaxies from flying apart, some additional gravity is needed. This is why the idea of an invisible substance called dark matter was first proposed. But nobody has ever seen the stuff. And there are no particles in the hugely successful Standard Model of particle physics that could be the dark matter—it must be something quite exotic.

This has led to the rival idea that the galactic discrepancies are caused instead by a breakdown of Newton’s laws. The most successful such idea is known as Milgromian dynamics or Mond, proposed by Israeli physicist Mordehai Milgrom in 1982. But our recent research shows this theory is in trouble.

Enlarge / Sometimes you gotta get your nose in there to remember the distinct aroma of 1980s RPG classics. (credit: Akupara Games)

There are people who relish the feeling of finally nailing down a cryptic clue in a crossword. There are also people unduly aggravated by a puzzlemaster's puns and clever deceptions. I'm more the latter kind. I don't even play the crossword—or Wordle or Connections or Strands—but my wife does, and she'll feed me clues. Without fail, they leave me in some strange state of being relieved to finally get it, yet also keyed up and irritated.

Cryptmaster, out now on Steam, GOG, and Itch.io for Windows, seems like the worst possible game for people like me, and yet I dig it. It is many things at once: a word-guessing game, a battle typing (or shouting) challenge, a party-of-four first-person grid-based dungeon crawler, and a text-prompt adventure, complete with an extremely goofy sense of humor. It's also in stark black and white. You cannot fault this game for a lack of originality, even while it evokes Wizardry, Ultima Underground, and lots of other arrow-key-moving classics, albeit with an active tongue-in-cheek filter.

The Cryptmaster in question has woken up four role-playing figures—fighter, rogue, bard, and wizard—to help him escape from his underground lair to the surface, for reasons that must be really keen and good. As corpses, you don't remember any of your old skills, but you can guess them. What's a four-letter action that a fighter might perform, or a three-letter wizard move? Every time you find a box or treasure, the Cryptmaster opens it, gives you a letter count, then lets you ask for clues. "SMELL," you type, and he says it has that wonderful old-paper smell. "LOOK," and he notes that there are writings and drawings on one side. Guess "SCROLL," and he adds those letters to your characters' next ability clues. Guess wrong, well, better luck next time.

Enlarge (credit: NASA Goddard/ASU)

Our Moon may appear to shine peacefully in the night sky, but billions of years ago, it was given a facial by volcanic turmoil.

One question that has gone unanswered for decades is why there are more titanium-rich volcanic rocks, such as ilmenite, on the near side as opposed to the far side. Now a team of researchers at Arizona Lunar and Planetary Laboratory are proposing a possible explanation for that.

The lunar surface was once flooded by a bubbling magma ocean, and after the magma ocean had hardened, there was an enormous impact on the far side. Heat from this impact spread to the near side and made the crust unstable, causing sheets of heavier and denser minerals on the surface to gradually sink deep into the mantle. These melted again and were belched out by volcanoes. Lava from these eruptions (more of which happened on the near side) ended up in what are now titanium-rich flows of volcanic rock. In other words, the Moon’s old face vanished, only to resurface.