The worst places to visit
A deadpan travel advisory for the most hostile worlds in the catalog. Every entry is a single, honest superlative computed from real data: no shade, no liquid water, and in most cases no way to survive the first second. Each category has a full record page with the top ten behind it: see all records. Prefer somewhere survivable? See the best places to visit.
- Hottest★☆☆☆☆KELT-9 b3648°C (6598°F)
Daytime hot enough to vaporize rock and metal. No surface, no shade, no return.
- Worst lava world★☆☆☆☆Kepler-1547 b2913°C (5275°F)
A rocky world so close to its star that the ground itself runs molten: oceans of lava, a sky of rock vapor.
- Coldest★☆☆☆☆WISPIT 2 b-240°C (-399°F)
Colder than almost anywhere in the solar system, cold enough to freeze gases solid.
- Most crushing gravity★☆☆☆☆Kepler-123 b6.4x Earth gravity
Surface gravity so strong that standing, let alone walking, would be a struggle.
- Shortest year★☆☆☆☆KOI-1843.034.2 hours
A rocky world skimming so close to its star that a whole year passes in a few hours, its dayside baked to glowing rock.
- Longest year★☆☆☆☆COCONUTS-2 b1,100,616 years
So far from its star that a single orbit can outlast all of recorded human history.
- What is the hottest known exoplanet?
- The hottest known exoplanet is KELT-9 b, with an estimated equilibrium temperature of about 3648°C (6598°F), hot enough to vaporize rock and metal. Everything about KELT-9 b → · Top ten →
- What is the hottest known lava world?
- The hottest known rocky exoplanet is Kepler-1547 b, a lava world with an estimated equilibrium temperature of about 2913°C (5275°F): hot enough that its surface runs molten. Everything about Kepler-1547 b → · Top ten →
- What is the coldest known exoplanet?
- The coldest known exoplanet is WISPIT 2 b, with an estimated equilibrium temperature of about -240°C (-399°F), cold enough to freeze most gases solid. Everything about WISPIT 2 b → · Top ten →
- Which exoplanet has the strongest surface gravity?
- Among rocky worlds with a physically consistent measured mass and size, Kepler-123 b has the strongest surface gravity known: 6.4 times Earth's. Everything about Kepler-123 b → · Top ten →
- Which exoplanet has the shortest year?
- Among confirmed rocky exoplanets, KOI-1843.03 has the shortest year known: one full orbit of its star takes about 4.2 hours. Everything about KOI-1843.03 → · Top ten →
- Which exoplanet has the longest year?
- The confirmed exoplanet with the longest year is COCONUTS-2 b: a single orbit of its star takes about 1,100,616 years. Everything about COCONUTS-2 b → · Top ten →
Each ranking is one category computed from a measured or derived value. We do not combine them into a single "deadliest" score: with atmosphere, wind, and radiation unknown for most worlds, any such score would be guesswork.