Host star — Kepler-452
- Spectral type
- G2
- Temperature
- 5,757 K
- Radius
- 1.11 R☉
- Mass
- 1.04 M☉
- Luminosity
- 1.215 L☉
- Distance
- 551.7 pc (1,799 ly)
Yellow star — the same class as our Sun.
Similar to our Sun (5,778 K).
Kepler-452 b
Orbits Kepler-452 · 1,799 light-years from Earth
Super-EarthTransit2015ESI 88 · Very Earth-like
Radius
1.63×
Earth
Mass
3.3×
Earth
Year
385d
Temp
265 K
-8°C
Gravity
1.2×
Earth
Distance
1,799
ly
Could life exist here?
AI analysisKepler-452 b orbits a sun-like star just 1,800 light-years away, making it one of astronomy's most famous exoplanet discoveries. At 1.63 times Earth's radius and 3.29 times Earth's mass, it is a super-Earth with a density of 4.17 grams per cubic centimeter, suggesting a rocky composition. Its equilibrium temperature of 265 Kelvin (minus 8 degrees Celsius) places it near the cold edge of the habitable zone, comparable to Earth's polar regions. The planet orbits every 385 days at 1.05 astronomical units from its host star, nearly matching Earth's year and distance, and a perfectly circular orbit means stable, predictable conditions. Whether 265 Kelvin permits surface liquid water depends on atmospheric composition—a thick greenhouse blanket could warm the surface, while a thin one would leave it frozen. The planet's exact atmospheric properties remain unknown, and its larger mass raises questions about geological activity and volatile retention that ground-based observations cannot yet answer. Kepler-452 b's 2015 discovery by the Kepler space telescope and its resemblance to Earth have made it a touchstone for the search for habitable worlds beyond our solar system.
What it would be like
Kepler-452 b is a super-Earth — larger than our planet but likely still rocky or ice-rich. Whether it has a thin atmosphere like Mars or a crushing one like Venus remains unknown.
Surface gravity is about 1.2g — noticeably heavier what you're used to on Earth.
With an equilibrium temperature around -8°C, this planet sits in the temperature range where liquid water could potentially exist on the surface — a key ingredient for life as we know it.
One orbit takes 384.84 days — a year here is 1.1× longer than Earth's.
Earth comparison
Logarithmic bars so Jupiter-class planets fit the same scale as Earth-size worlds.
Radius1.63R⊕
1/25×Earth = 125×
Mass3.29M⊕
1/10000×Earth = 110000×
Surface gravity1.24g
1/100×Earth = 1100×
Equilibrium temp265 K(-8°C)
0 KEarth 255 K2500 K
Side-by-side with Earth
Temperature in context
Liquid N₂Mars avgEarth eq.Earth sfc.Boiling H₂OVenus
Discovery & orbit
- Method
- Transit
- Year
- 2015
- Facility
- Kepler
- Semi-major axis
- 1.0460 AU
- Period
- 384.84 days
- Eccentricity
- 0.0000
- Density
- 4.17 g/cm³
Detected by measuring the tiny dip in starlight as the planet crosses in front of its star.
Nearly circular orbit.
Rocky composition likely. Earth is 5.51 g/cm³.
Discovered via · Transit
Tiny dip in starlight as the planet crosses in front of its star
A transit photometer watches a star nonstop and measures its brightness to ~0.01%. When a planet passes between us and the star, the star dims briefly — the deeper the dip, the bigger the planet. This is how Kepler and TESS found most known exoplanets.
- Overall share
- ~75% of all confirmed worlds
- Best for
- Earth-to-Neptune-sized planets on short orbits
Orbital Animation
Kepler-452Kepler-452 bOrbitEarth orbitHabitable zone
Drag to rotate · scroll to zoomSemi-major axis: 1.046 AUEccentricity: 0.0000Period: 1.05 years
Hertzsprung–Russell Diagram
Where this host star sits among … exoplanet host stars. The main sequence band runs diagonally — giants and supergiants sit above, white dwarfs below.
OBAFGKMCurrent star
How far is 1,799 light-years?
- A light beam leaving Earth right now would arrive in 1,799 years.
- At Voyager 1's speed (17 km/s), the trip would take approximately 31.7 million years.
- A radio signal sent today would arrive in 1799.5 years — and the reply wouldn't come back for twice that.
Earth Similarity Index
88/1000 — Nothing like Earth100 — Identical to Earth
ESI combines radius similarity and equilibrium temperature similarity. Earth = 100. Mars ≈ 73. Venus ≈ 44. This score reflects two physical parameters only — not atmosphere, water, or magnetic field.