- weight
- 21.50 g
- sun
- 85.2× wider
- sky
- deep orange
Illustration computed from this world’s measured and derived values, not a photograph.
KOI-1843.03
KOI-1843.03 is a confirmed rocky exoplanet 438 ly from Earth in the constellation Lyra, discovered in 2013 by Kepler.
★ Shortest year knownAmong confirmed rocky exoplanets, KOI-1843.03 has the shortest year known: one full orbit of its star takes about 4.2 hours.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on KOI-1843.03, you would weigh about 2050% more than you do on Earth. Its red dwarf looks 85.2× wider than ours, bathing the surface in deep 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 4.2 hours, and at an estimated 1381°C (2518°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
Beyond about four times Earth's gravity, a growing child's skeleton could not carry its own weight. A human body simply could not develop here, even sheltered indoors. The shape below is only where the trend points before biology gives out: short, and impossibly dense.
- Bones
- Thick and dense
- More weight to bear forces the skeleton to grow denser and stronger all through childhood.
- Heart
- Large and powerful
- Pushing blood upward against stronger gravity demands a bigger, harder-working heart.
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 1381°C (2518°F), sound would travel roughly 140% 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 1381°C (2518°F), the daytime side glows: metals run liquid and any atmosphere is being torn away.
- !Gravity is 21.5 times Earth's, near the limit at which a person can stand or walk at all.
- !Its star delivers about 1,769 times the sunlight Earth gets, a blinding, sterilizing glare.
- !Earth-similarity index 0.07: 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-1843.03’s measured and computed values, not a real advisory.
How long to get there · 438 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-1843.03?
KOI-1843.03's surface gravity is about 21 times Earth's.
How much would you weigh on KOI-1843.03?
Someone who weighs 150 pounds on Earth would weigh about 3,225 pounds on KOI-1843.03.
How far is KOI-1843.03 from Earth?
KOI-1843.03 lies about 438 light-years from Earth.
How long would it take to get to KOI-1843.03?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 683,208 years.
How hot is KOI-1843.03?
KOI-1843.03's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 1381°C (2518°F).
How long is a year on KOI-1843.03?
KOI-1843.03 completes one orbit of its star in 4.2 hours.
Illustration generated from KOI-1843.03's confirmed parameters, not a photograph.