Eris

Eris marks the final stop of a remarkable astronomical trail in the Izera Mountains — a stone model of the dwarf planet Eris, standing on the summit of Stóg Izerski in the Mirsk municipality. It is the endpoint of the "Solar System Model" educational path, one of the most original nature trails in Lower Silesia, blending a mountain hike with an open-air astronomy lesson.

What exactly is this?

The trail places boulders representing the Sun, the eight planets, and five dwarf planets along a route built at a scale of 1:1,000,000,000 — meaning one metre on the ground corresponds to one million kilometres in real space. It was designed by astronomers from the Astronomical Institute of the University of Wrocław, Dr. Tomasz Mrozek and Dr. Sylwester Kołomański, together with forester Zbigniew Kamiński from Świeradów-Zdrój and Stanisław Kornfel, owner of the Orle Tourist Station. Each boulder was sourced from a different Lower Silesian quarry, with the stone's colour chosen to echo the actual colour of the planet it represents.

The route begins in Orle with a model of the Sun and runs through the planets in order, ending at Stóg Izerski with the model of Eris — at the time of the model's creation, the most distant known dwarf planet in the Solar System. Placing it on one of the higher summits of the Izera Mountains is a fitting symbol of its position at the outer edge of our planetary system. The full trail measures roughly 11.2 kilometres.

How do you get to Stóg Izerski?

Stóg Izerski (1,105 m above sea level) sits in the north-western part of the Izera Mountains, close to the Polish-Czech border, formally within the Mirsk municipality, though the nearest larger town is the spa resort of Świeradów-Zdrój. The easiest approach starts from there, following hiking trails up to the summit, where a PTTK mountain hut operates about 50 metres below the top. A gondola lift also serves the area, considerably shortening the climb for less experienced hikers.

What will you see there?

The Eris model itself is a modest boulder with a descriptive plaque and a carved sphere representing the dwarf planet's size at the trail's scale. The real draw, though, is not the single object but the journey: reaching it means symbolically walking the entire Solar System on foot, from the Sun to its farthest reaches. The summit of Stóg Izerski also offers a wide panorama over the Izera Mountains and the Polish-Czech borderland, and the nearby PTTK hut is a good place to rest and eat before heading back down.

When is the best time to visit?

May through October is the best window, when the trails are dry and passable and views from the open summit are at their clearest. In winter the route can be snow-covered and demands proper preparation, though the snowy Izera landscape draws its own share of winter hikers.

Frequently asked questions

Is this an actual dwarf planet? No — it's a stone model at a scale of 1:1,000,000,000, part of the educational "Solar System Model" astronomical trail in the Izera Mountains.

Where exactly does the Eris model stand? On the summit of Stóg Izerski (1,105 m), formally within the Mirsk municipality, near Świeradów-Zdrój.

How long is the full astronomical trail? The complete route from the Sun model in Orle to the Eris model on Stóg Izerski is about 11.2 km.

Is there somewhere to rest near the summit? Yes, a PTTK mountain hut operates about 50 metres below the top, and a gondola lift also serves the area.