- weight
- ≈ 0.78 g
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
K2-209 b
K2-209 b is a confirmed rocky exoplanet 250 ly from Earth in the constellation Cetus, discovered in 2018 by K2.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on K2-209 b, you would weigh roughly about 22% less than you do on Earth. Bathing the surface in amber-orange light. A year passes in just 2.1 days.
What these mean: surface gravity · tidal locking · equilibrium temperature
If your children grew up herea playful thought experiment
Lighter than home, at about 0.78 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, about 0.78 times, so you would move much as you do here.
A playful read of K2-209 b’s measured and computed values, not a real advisory.
How long to get there · 250 ly away
No other confirmed planets here yet. New ones auto-appear as telescopes report.
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 K2-209 b?
K2-209 b's surface gravity is about 0.78 times Earth's, estimated from its size.
How much would you weigh on K2-209 b?
Someone who weighs 150 pounds on Earth would weigh about 117 pounds on K2-209 b.
How far is K2-209 b from Earth?
K2-209 b lies about 250 light-years from Earth.
How long would it take to get to K2-209 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 389,130 years.
How long is a year on K2-209 b?
K2-209 b completes one orbit of its star in 2.1 days.
Illustration generated from K2-209 b's confirmed parameters, not a photograph.