- weight
- 0.42 g
- sun
- 11.7× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
Kepler-28 b
Kepler-28 b is a confirmed sub-Neptune exoplanet 1,430 ly from Earth in the constellation Cygnus, discovered in 2011 by Kepler.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on Kepler-28 b, you would weigh about 58% less than you do on Earth. Its orange dwarf looks 11.7× wider than ours, bathing the surface in amber-orange 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 5.9 days, and at an estimated 312°C (593°F) it is blistering.
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
Low gravity, 0.42 times Earth's. A child who grew up here could become strikingly tall and lightly built, about 1.2x taller than on Earth: a 5 ft 10 in adult could stand nearer 6 ft 11 in, with long limbs and slender bones.
- 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.
- Heart
- Unhurried
- With less weight pulling blood down toward the feet, the heart has far less work to do.
- 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 high and thin, almost cartoonish.
Assuming Earth-like air at this world's temperature of about 312°C (593°F), sound would travel roughly 43% faster than on Earth, so your voice would sound high and thin, almost cartoonish. The real atmosphere is unknown, so this is a best guess.
A real voice sample, pitch-shifted (tempo held constant) to suggest the acoustics: a playful approximation, not a precise simulation. Voice: Lingua Libre / Vealhurl, CC BY-SA 4.0.
- !Blistering at about 312°C (593°F), far too hot for liquid water on the surface.
- !Low gravity, 0.42 times Earth's, would hold only a thin, unbreathable atmosphere at best.
- !Its star delivers about 63 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of Kepler-28 b’s measured and computed values, not a real advisory.
How long to get there · 1,430 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 Kepler-28 b?
Kepler-28 b's surface gravity is about 0.42 times Earth's.
How much would you weigh on Kepler-28 b?
Someone who weighs 150 pounds on Earth would weigh about 64 pounds on Kepler-28 b.
How far is Kepler-28 b from Earth?
Kepler-28 b lies about 1,430 light-years from Earth.
How long would it take to get to Kepler-28 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 2.2 million years.
How hot is Kepler-28 b?
Kepler-28 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 312°C (593°F).
How long is a year on Kepler-28 b?
Kepler-28 b completes one orbit of its star in 5.9 days.
Illustration generated from Kepler-28 b's confirmed parameters, not a photograph.