- weight
- 0.76 g
- sun
- 33.6× wider
- sky
- icy blue-white
Illustration computed from this world’s measured and derived values, not a photograph.
KOI-55 b
KOI-55 b 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 b, you would weigh about 24% less than you do on Earth. Its blue-white star looks 33.6× 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 5.8 hours, and at an estimated 7505°C (13540°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
Lighter than home, at 0.76 times Earth's gravity. A child raised here would likely grow taller and more slender than their Earth-raised parents, about 1.1x taller than on Earth: a 5 ft 10 in adult could stand nearer 6 ft 2 in.
- Bones
- Light and slender
- With little weight to carry, the growing skeleton lays down far less bone, the way astronauts' bones thin in months of low gravity.
- Movement
- Bounding and springy
- So little weight means each step would carry the body up and forward in long, floating strides.
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, 0.76 times, so you would move much as you do here.
- !Its star delivers about 636,352 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 b’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 b?
KOI-55 b's surface gravity is about 0.76 times Earth's.
How much would you weigh on KOI-55 b?
Someone who weighs 150 pounds on Earth would weigh about 115 pounds on KOI-55 b.
How far is KOI-55 b from Earth?
KOI-55 b lies about 4,015 light-years from Earth.
How long would it take to get to KOI-55 b?
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 b?
KOI-55 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 7505°C (13540°F).
How long is a year on KOI-55 b?
KOI-55 b completes one orbit of its star in 5.8 hours.
Illustration generated from KOI-55 b's confirmed parameters, not a photograph.