- weight
- ≈ 0.55 g
- sun
- 4.0× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
Kepler-378 c
Kepler-378 c is a confirmed rocky exoplanet 496 ly from Earth in the constellation Cygnus, discovered in 2014 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-378 c, you would weigh roughly about 45% less than you do on Earth. Its orange dwarf looks 4.0× 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 29 days, and at an estimated 141°C (286°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
Lighter than home, at about 0.55 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 7 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 noticeably higher and reedier.
Assuming Earth-like air at this world's temperature of about 141°C (286°F), sound would travel roughly 20% faster than on Earth, so your voice would sound noticeably higher and reedier. 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.
- !Persistently hot at around 141°C (286°F), well above anything you would call comfortable.
- !Low gravity, about 0.55 times Earth's, would hold only a thin, unbreathable atmosphere at best.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of Kepler-378 c’s measured and computed values, not a real advisory.
How long to get there · 496 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-378 c?
Kepler-378 c's surface gravity is about 0.55 times Earth's, estimated from its size.
How much would you weigh on Kepler-378 c?
Someone who weighs 150 pounds on Earth would weigh about 83 pounds on Kepler-378 c.
How far is Kepler-378 c from Earth?
Kepler-378 c lies about 496 light-years from Earth.
How long would it take to get to Kepler-378 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 773,665 years.
How hot is Kepler-378 c?
Kepler-378 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 141°C (286°F).
How long is a year on Kepler-378 c?
Kepler-378 c completes one orbit of its star in 29 days.
Illustration generated from Kepler-378 c's confirmed parameters, not a photograph.