- weight
- ≈ 1.01 g
- sun
- 16.9× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
K2-204 b
K2-204 b is a confirmed sub-Neptune exoplanet 1,883 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 K2-204 b, you would weigh roughly almost exactly what you weigh on Earth. Its yellow, Sun-like star looks 16.9× wider than ours, bathing the surface in warm 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 7.1 days, and at an estimated 875°C (1607°F) it is furnace-hot.
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 about 1.0 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 high and thin, almost cartoonish.
Assuming Earth-like air at this world's temperature of about 875°C (1607°F), sound would travel roughly 100% 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.
- !Furnace-hot at around 875°C (1607°F), with no liquid water and no shade anywhere.
- Surface gravity is close to Earth's, about 1.01 times, so you would move much as you do here.
- !Its star delivers about 290 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Earth-similarity index 0.17: 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 K2-204 b’s measured and computed values, not a real advisory.
How long to get there · 1,883 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 K2-204 b?
K2-204 b's surface gravity is about 1.0 times Earth's, estimated from its size.
How much would you weigh on K2-204 b?
Someone who weighs 150 pounds on Earth would weigh about 152 pounds on K2-204 b.
How far is K2-204 b from Earth?
K2-204 b lies about 1,883 light-years from Earth.
How long would it take to get to K2-204 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 2.9 million years.
How hot is K2-204 b?
K2-204 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 875°C (1607°F).
How long is a year on K2-204 b?
K2-204 b completes one orbit of its star in 7.1 days.
Illustration generated from K2-204 b's confirmed parameters, not a photograph.