TRAPPIST refers to three connected things: a Catholic monastic order known for brewing some of the world’s most prized beers, a telescope named after those monks, and a star system discovered by that telescope. The word traces back to the Abbey of La Trappe in France, where a 17th-century reform movement created a stricter branch of monks who still live, pray, and brew today. Here’s how one word ties together medieval monasteries, world-class beer, and the search for life beyond Earth.
The Trappist Monks
Trappists are members of the Order of Cistercians of the Strict Observance, a branch of Catholic monasticism rooted in the Benedictine tradition. The name comes from the Abbey of Notre Dame de La Trappe in Normandy, France, where a reform movement in the 1600s pushed for a return to stricter monastic discipline. Pope Alexander VII formally addressed divisions over this reform in 1666, and by 1834, Pope Gregory XVI united various Trappist houses in France into a single congregation within the Cistercian Order.
Trappist monks and nuns live by the principle of “ora et labora,” Latin for “pray and work.” Their daily life revolves around communal prayer, manual labor, and silence. They are perpetual vegetarians, following the Rule of St. Benedict. Their diet consists of bread, pasta, fruit, vegetables, beans, potatoes, and eggs, with seafood occasionally appearing on special holy days. This isn’t ideological vegetarianism. The monks view it as a form of self-denial, similar to Catholics abstaining from meat on Fridays during Lent, except Trappists observe it year-round. The food, like everything in the monastery, is meant to be nourishing but simple.
Trappist Beer and the ATP Label
Trappist monasteries have brewed beer for centuries as a way to sustain their communities, and today their beers rank among the most respected in the world. Eleven abbeys currently hold membership in the International Trappist Association and brew beer under the “Authentic Trappist Product” (ATP) label. Most are in Belgium, but certified Trappist breweries also operate in the Netherlands, France, Italy, and Spain.
To carry the ATP label, a brewery must meet three strict criteria. First, all products must be made within the immediate surroundings of the abbey. Second, production must be carried out under the supervision of the monks or nuns. Third, profits must go toward the needs of the monastic community, solidarity projects within the Trappist Order, or charitable works. This means Trappist beer is not a style you can imitate and label freely. It’s a designation of origin and process, somewhat like Champagne.
The most famous Trappist breweries include Chimay (produced at Scourmont Abbey), Westmalle, Orval, Rochefort, and Westvleteren, all in Belgium. Westvleteren in particular has a near-mythical reputation, with limited production and no widespread distribution. La Trappe, brewed at Koningshoeven Abbey in the Netherlands, is the most widely available outside Europe. Newer entrants include Zundert (from Maria Toevlucht Abbey), Mont des Cats in French Flanders, Tre Fontane in Rome, and Cardeña in Spain.
The TRAPPIST Telescope
TRAPPIST is also an acronym: TRAnsiting Planets and PlanetesImals Small Telescope. It’s a ground-based telescope designed to detect planets by watching for tiny dips in starlight that occur when a planet passes in front of its star. The telescope’s creators, a team of Belgian astronomers, chose the name as a nod to their country’s Trappist brewing heritage.
This relatively small telescope punched well above its weight in 2016 when it detected three planets orbiting an ultracool dwarf star about 40 light-years from Earth. Follow-up observations using NASA’s Spitzer Space Telescope and other observatories eventually revealed a total of seven rocky worlds in the system. The star was named TRAPPIST-1 after the telescope that first spotted its planets.
The TRAPPIST-1 Star System
TRAPPIST-1 is a tiny, cool star classified as an M8.0 V dwarf, located roughly 40 light-years from Earth (about 12.4 parsecs). It’s much smaller and dimmer than our Sun, which means its planets orbit extremely close to it. All seven worlds, labeled TRAPPIST-1 b through h, complete an orbit in a matter of days rather than months or years.
What makes this system extraordinary is that all seven planets are rocky, roughly Earth-sized, and several sit within the habitable zone, the orbital range where temperatures could allow liquid water to exist on a planet’s surface. No other known star system packs so many potentially Earth-like worlds into such a compact space. The planets are so close together that if you stood on one, neighboring planets would sometimes appear larger in the sky than the Moon does from Earth.
What JWST Has Found So Far
The James Webb Space Telescope has begun examining the TRAPPIST-1 planets for signs of atmospheres, and the early results are sobering. Observations of TRAPPIST-1 b, the innermost planet, indicate it is most likely a bare rock with no detectable carbon dioxide atmosphere. TRAPPIST-1 c tells a similar story. Researchers measured its dayside temperature at roughly 380 K (about 225°F), which is too hot to support a thick, carbon dioxide-rich atmosphere. The data rule out Venus-like conditions with sulfuric acid clouds and rule out dense atmospheres with surface pressures above 10 bar if even trace amounts of CO2 are present.
These findings suggest that at least the innermost planets formed with relatively few volatile compounds, possibly less than 9.5 Earth oceans’ worth of water. That doesn’t necessarily doom the entire system. The outer planets, particularly those in the habitable zone, orbit farther from the star and receive less radiation. They remain prime targets for atmospheric study as JWST continues its observations. The question of whether any TRAPPIST-1 planet holds an atmosphere, and possibly water, is still open for the worlds that matter most.
Why One Word Connects All Three
The thread is straightforward. Belgian astronomers built a telescope, named it after their country’s most famous monastic tradition, then used it to discover the most promising star system for finding habitable worlds beyond our own. The monks of La Trappe could not have imagined, when they began reforming monastic life in the 1600s, that their name would one day label both globally celebrated beers and a star system 40 light-years away. But the connection is a real one, running from a French abbey through Belgian brewing culture to the frontiers of planetary science.