Planets – BLDGBLOG

Speculative Mineralogy

[Image: An otherwise unrelated image of crystal twinning, via Geology IN].

It’s hard to resist a headline like this: writing for Nature, Shannon Hall takes us inside “the labs that forge distant planets here on Earth.”

This is the world of exogeology—the geology of other planets—“a research area that is bringing astronomers, planetary scientists and geologists together to explore what exoplanets might look like, geologically speaking. For many scientists, exogeology is a natural extension of the quest to identify worlds that could support life.”

To understand how other planets are made, exogeologists are synthesizing those planets in miniature in the earthbound equipment in their labs. Think of it as an extreme example of landscape modeling. “To gather information to feed these models,” Hall writes, “geologists are starting to subject synthetic rocks to high temperatures and pressures to replicate an exoplanet’s innards.”

Briefly, it’s easy to imagine an interesting jewelry line—or architectural materials firm—using fragments of exoplanets in their work, crystals grown as representations of other worlds embedded in your garden pavement. Or fuse the ashes of your loved ones with fragments of hypothetical exoplanets. “Infinite memorialization,” indeed.

In any case, recall that, back in 2015, geologist Robert Hazen “predict[ed] that Earth has more than 1,500 undiscovered minerals and that the exact mineral diversity of our planet is unique and could not be duplicated anywhere in the cosmos.” As Hazen claimed, “Earth’s mineralogy is unique in the cosmos.” If we are, indeed, living in mineralogically unique circumstances, then this would put an end to the fantasy of finding a geologically “Earth-like” planet. But the search goes on.

This is not the only example of producing hypothetical mineral models of other worlds. In 2014, for example, ScienceDaily reported that “scientists for the first time have experimentally re-created the conditions that exist deep inside giant planets, such as Jupiter, Uranus and many of the planets recently discovered outside our solar system.” Incredibly, this included compressing diamond to a concentration denser than lead, using a giant laser.

Other worlds, produced here on Earth. Exoplanetary superdiamonds.

“We’re opening up the solar system”

[Image: Cropped Apollo mission panorama, courtesy Lunar and Planetary Institute, via @Rainmaker1973; view full].

Some lunar news: “The first company to apply for a commercial space mission beyond Earth orbit has just received approval from the federal government,” Ars Technica reports. “As part of the Google Lunar X Prize competition, Moon Express intends to launch a small, single-stage spacecraft to land on the Moon by the end of 2017.”

“We’re opening up the solar system,” company co-founder Bob Richards says, with at least some degree of over-statement.

As the Wall Street Journal suggested back in June, the mission could prove to be merely “the first in an array of for-profit ventures throughout the solar system,” and it is “expected to set important legal and diplomatic precedents for how Washington will ensure such nongovernmental projects comply with longstanding international space treaties.”

There will be a lot to watch for in the next few years, in other words, including the archaeological implications of these missions.

On a vaguely related note, the company’s other cofounder is Naveen Jain, who has what sounds like a pretty amazing private meteorite collection.

The Labyrinth of Night, The Polar Gothic, and a Golden Age for Landscape Studies

It’s hard to resist a place called the Noctis Labyrinthus, or “the Labyrinth of Night,” especially when it’s on Mars.

[Image: Courtesy ESA/DLR/FU Berlin].

“This block of martian terrain, etched with an intricate pattern of landslides and wind-blown dunes, is a small segment of a vast labyrinth of valleys, fractures and plateaus,” the European Space Agency reported earlier this week.

“As the crust bulged in the Tharsis province it stretched apart the surrounding terrain, ripping fractures several kilometres deep and leaving blocks—graben—stranded within the resulting trenches,” the ESA adds. “The entire network of graben and fractures spans some 1200 km, about the equivalent length of the river Rhine from the Alps to the North Sea.”

In other words, it’s an absolutely massive expanse of desert canyons and landslides, stretching roughly the distance from Switzerland to Rotterdam—a “700-mile labyrinth of fractures and landslides,” in the words of the reliably interesting Corey Powell on Twitter.

Imagine hiking there.

[Image: Courtesy ESA/DLR/FU Berlin].

We are living in something of a golden age for landscape studies. Over a remarkably short span of time, for example, we’ve learned that there are sinkholes on comets—that is, that comets have undergrounds. They have pores, caves, and tunnels, with sinkholes explosively airing this subterranean world into outer space. These “mysterious, steep-sided pits—one up to 600 feet wide and 600 feet deep,” as National Geographic described them, indicate that “there must be gaps inside.” Picture caves and tunnels evaporating in the darkness, before collapsing in on themselves in a crystalline flash.

Meanwhile, I have always loved the fact that there is a mountain range on Mars named after dead American astronauts, as if the Red Planet is somehow haunted in advance of human arrival by the mythological figures of explorers who never made it there. But this is just one small example of how a radically unfamiliar environment can gradually become known through the process of naming.

[Image: From India’s Mars Orbiter, via @coreyspowell].

My wife, Nicola Twilley, was actually at the Johns Hopkins Applied Physics Laboratory for the recent Pluto flyby, covering it for The New Yorker; she wrote a great description of how the former planet became a true landscape:

As the scientists traced tendrils of reddish brown and speculated as to the rate of melt at the edge of a two-toned ice patch near Pluto’s equator, the impossibly distant world came to life. Fed up with referring to features as, for instance, “the black circle at two o’clock” and “the big white patch,” the team had started to give them names—first nicknames, such as “the heart” and “the whale,” and then unofficial but more formal names drawn from the mythology of the underworld. The whale became Lovecraft’s Cthulhu, and a nearby dark smudge was christened Balrog, after the demons of Tolkien’s Middle-earth. An alien landscape had started to become a collection of places: knowable, if not yet known.

Interestingly, it seems that names come first, algorithms later.

In any case, while naming, of course, lends an air of familiarity to alien terrains—or knowability, we might say—the utterly bonkers nature of these landscapes remains extraordinary.

Nicky later revisited the subject, for example, writing that “the reddish patches” seen on Pluto might actually be “the organic material nicknamed ‘star tar,’ a precursor to life”—sludge awaiting sentience—and that “cryovolcanoes—volcanoes that spew slushy methane and nitrogen ice rather than molten rock,” might exist at the planet’s south pole.

There, this slow-moving matrix of frozen elements would circulate amongst other “exotic ices” in the distant cold, surely another kind of “labyrinth of night,” if there ever was one.

Think of what writer Victoria Nelson has called the “polar Gothic,” referring to an era of science-fictional representations of the Earth’s own polar regions as places of psychological menace and theological mystery; now picture weird slurries of nitrogen and star-tar sinkholes in a region named after Cthulhu, and it seems that perhaps the great age of landscape exploration has only now truly begun.

Consider, for example, this tweet by Rob Minchin, referring to the latest geological revelations coming from Pluto, a world of nitrogen glaciers and ice tectonics. “Water ice floats on nitrogen or CO ice,” he explains. This means, unbelievably, that “numerous mountains on Pluto appear to be floating.”

[Image: Pluto, via @CoreySPowell].

Even within our own solar system, it seems, if you have an idea for a landscape so unreal it borders on pure fantasy, there is a planet, comet, or asteroid already exceeding it.

(In addition to @CoreySPowell, another good Twitter account for offworld landscape studies is @LoriKFenton, as the images seen at the link make clear).

Dead Ringer

[Image: Mars’s moon, Phobos; courtesy NASA /JPL/University of Arizona].

Oh, to live another 40 million years… “One day,” Nature reports, “Mars may have rings like Saturn does”:

The martian moon Phobos, which is spiralling inexorably closer towards the red planet, will disintegrate to form a ring system some 20 million to 40 million years from now, according to calculations published on 23 November. Other research suggests that long grooves on Phobos’s surface may represent the first stages of that inevitable crack-up.

After that point, a red mineral ring will gradually coalesce from the dust storm, circling the planet in a desert halo.

In terms of human experience, 20-40 million years obviously dwarfs our anatomical and genetic history as modern Homo sapiens, and I am excessively confident that no humans will be around to witness this event. Nonetheless, it’s not actually that far off. The Earth itself is 4.5 billion years old; 20-40 million years is the geological blink of an eye. In a sense, we will just miss it.

For what it’s worth, Neal Stephenson’s most recent novel, Seveneves, is about a similar event—but set on Earth, not Mars.

“What if Earth’s moon suddenly and spontaneously broke apart into seven large pieces?” a review in the New York Times asked. “What would happen to life on Earth? It’s an intriguing premise, one that could conceivably go in any number of interesting directions. What would be the ramifications for every aspect of society, including economics, governance, the rule of law, privacy and security, not to mention even more fundamental matters like reproductive rights, religion and belief?”

In any case, read more over at Nature.

Offworld Glaciology

[Image: Photo by Gerco de Ruijter, via but does it float].

A short article by Sam Kean for the Chemical Heritage Foundation in Philadelphia explores the world of “bizarro ice—ice that burns, ice that sinks instead of floating, ice literally out of this world.” For the most part, these are ices that have formed under extraordinary pressure, whether naturally or artificially applied, which “forc[es] H2O molecules into rhombuses, tetragons, and other alternative geometries.”

In some cases, the pressure is so great that the resulting ice “can stay solid at temperatures of thousands of degrees—a true freezer burn. If you could somehow plop chunks of these ices into a glass of liquid water, they’d vaporize it.” Incredibly, we read that, “at super-high pressures, some chemists predict that ice transforms into a metal.”

There is an ice “that’s structurally similar to diamonds,” Kean explains, that “probably exists in the upper atmosphere.” And there are exotic ices on other planets: “The dense, hot interiors of Neptune and Uranus probably contain chunks of nonhexagonal ices, as do exoplanets around distant stars, a potentially important consideration as we search for life beyond our solar system.”

[Image: The Sea of Ice by Caspar David Friedrich].

This latter remark brings to mind a book I downloaded in my recent PDF binge called The Science of Solar System Ices, edited by Murthy S. Gudipati and Julie Castillo-Rogez. It’s a mammoth book—more than 650 pages—that explores exotic ices found in comets, on exoplanets, on moons, and elsewhere in our solar system.

“The largest deposits of carbon dioxide ice,” we learn, “is on Mars. Sulfur dioxide ice is found in the Jupiter system. Nitrogen and methane ices are common beyond the Uranian system. Saturn’s moon Titan probably has the most complex active chemistry involving ices, with benzene and many tentative or inferred compounds,” including a long list of chemicals I can’t even pronounce let alone recognize or describe, forming ices with “unusual colors and spectral shapes.” There are even “organic” ices made of hydrocarbons.

[Image: The Monk by the Sea by Caspar David Friedrich].

How these ices produce landscapes is by far the most interesting aspect here, at least from the point of view of BLDGBLOG: how they glaciate, experience gravitational tides and weathering, melt from below due to volcanoes, reflect the alien skies shining down on them in distorted shapes and angled echoes, and even how they tectonically fracture into karst-like networks of sinkholes and caves.

Imagining snow storms of frozen methane on other planets while thinking about, for example, human artistic traditions of landscape representation, from the Hudson Valley School to Caspar David Friedrich—picturing massive and extraordinary widescreen scenes of glacial hills and valleys steaming in the outer darkness of the solar system and the paintings or photographs or even animated GIFs that might result—would extend the idea of the sublime to non-terrestrial landscapes and the sights they might someday reveal to human explorers.

[Image: Walking into a glacier: “Grindelwald Grotto, Bernese Oberland, Switzerland,” courtesy of the Library of Congress Prints & Photographs Division].

Art historians would gaze in awe at offworld glaciers of carbon dioxide ice and howling massifs of frozen nitrogen, where volcanoes erupt not with liquid rock but with “ice slurries” and groundwater exploding onto the landscape with the force of a Kilauea.

Perhaps someday you’ll be able to get a degree in the field of exploratory xenoglaciology, the study of rare and incredible landforms made of frozen chemicals in space.

(“Wild Ice” story spotted via @nicolatwilley).