- weight
- ≈ 1.30 g
- sun
- 49.7× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
K2-187 b
K2-187 b is a confirmed rocky exoplanet 1,079 ly from Earth in the constellation Cancer, 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 K2-187 b, you would weigh roughly about 30% more than you do on Earth. Its yellow, Sun-like star looks 49.7× 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 18.6 hours, and at an estimated 1542°C (2807°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
A little heavier than home, at about 1.3 times Earth's gravity. A child raised here would likely grow a little shorter and sturdier than their Earth-raised parents, about 0.95x as tall as on Earth: a 5 ft 10 in adult could stand nearer 5 ft 7 in, with denser bones.
- Bones
- Thick and dense
- More weight to bear forces the skeleton to grow denser and stronger all through childhood.
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 1542°C (2807°F), sound would travel roughly 151% 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.
- !At about 1542°C (2807°F), the daytime side glows: metals run liquid and any atmosphere is being torn away.
- Surface gravity is close to Earth's, about 1.30 times, so you would move much as you do here.
- !Its star delivers about 2,367 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Earth-similarity index 0.14: 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 K2-187 b’s measured and computed values, not a real advisory.
How long to get there · 1,079 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 K2-187 b?
K2-187 b's surface gravity is about 1.3 times Earth's, estimated from its size.
How much would you weigh on K2-187 b?
Someone who weighs 150 pounds on Earth would weigh about 195 pounds on K2-187 b.
How far is K2-187 b from Earth?
K2-187 b lies about 1,079 light-years from Earth.
How long would it take to get to K2-187 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 1.7 million years.
How hot is K2-187 b?
K2-187 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 1542°C (2807°F).
How long is a year on K2-187 b?
K2-187 b completes one orbit of its star in 18.6 hours.
Illustration generated from K2-187 b's confirmed parameters, not a photograph.