- weight
- 0.87 g
- sun
- 26.6× wider
- sky
- icy blue-white
Illustration computed from this world’s measured and derived values, not a photograph.
KOI-55 c
KOI-55 c is a confirmed rocky exoplanet 4,015 ly from Earth in the constellation Cygnus, discovered in 2011 by Kepler.
Orbital Brightness Modulation: spotted by subtle changes in the system’s brightness as it orbits.
Standing on KOI-55 c, you would weigh about 13% less than you do on Earth. Its blue-white star looks 26.6× wider than ours, bathing the surface in icy blue-white light. It is likely tidally locked, so that sun never moves in the sky: one hemisphere in endless day, the other in permanent night. A year passes in just 8.2 hours, and at an estimated 6638°C (11980°F) it is hot enough to melt rock.
How closely this world matches Earth in size and warmth, from 0 to 1 (Earth = 1.0). Computed by gravityfinder. See every world ranked →
What these mean: surface gravity · tidal locking · equilibrium temperature · Earth similarity
If your children grew up herea playful thought experiment
Gravity close to Earth's, at 0.87 times. A child would grow up much as they would back home.
A playful thought experiment from this world’s gravity, not a prediction about any real person. No human has ever grown up off Earth, so no one truly knows; the direction (taller in low gravity, shorter and stockier in high) follows how growing bodies respond to weight.
Hear how a voice sounds herea computed acoustic demo
Your voice would sound much as it does on Earth.
We do not yet have a temperature for this world, and its atmosphere is unknown, so its acoustics cannot be modelled. In Earth-like air a human voice carries as you know it, and without the temperature that is as far as the physics will take us.
- Surface gravity is close to Earth's, 0.87 times, so you would move much as you do here.
- !Its star delivers about 396,618 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Earth-similarity index 0.02: this world has almost nothing in common with our own.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of KOI-55 c’s measured and computed values, not a real advisory.
How long to get there · 4,015 ly away
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
Matched telescope & eyepiece recommendations are coming. Any product links will carry a clear affiliate disclosure.
What is the gravity on KOI-55 c?
KOI-55 c's surface gravity is about 0.87 times Earth's.
How much would you weigh on KOI-55 c?
Someone who weighs 150 pounds on Earth would weigh about 131 pounds on KOI-55 c.
How far is KOI-55 c from Earth?
KOI-55 c lies about 4,015 light-years from Earth.
How long would it take to get to KOI-55 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 6.3 million years.
How hot is KOI-55 c?
KOI-55 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 6638°C (11980°F).
How long is a year on KOI-55 c?
KOI-55 c completes one orbit of its star in 8.2 hours.
Illustration generated from KOI-55 c's confirmed parameters, not a photograph.