- weight
- ≈ 1.32 g
- sun
- 18.6× wider
- sky
- dim red
Illustration computed from this world’s measured and derived values, not a photograph.
LP 791-18 b
LP 791-18 b is a confirmed rocky exoplanet 86.4 ly from Earth in the constellation Crater, discovered in 2019 by Transiting Exoplanet Survey Satellite (TESS).
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on LP 791-18 b, you would weigh roughly about 32% more than you do on Earth. Its red dwarf looks 18.6× wider than ours, bathing the surface in dim red 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 22.8 hours, and at an estimated 291°C (556°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
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 6 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 291°C (556°F), sound would travel roughly 40% 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.
- !Blistering at about 291°C (556°F), far too hot for liquid water on the surface.
- Surface gravity is close to Earth's, about 1.32 times, so you would move much as you do here.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of LP 791-18 b’s measured and computed values, not a real advisory.
How long to get there · 86.4 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 LP 791-18 b?
LP 791-18 b's surface gravity is about 1.3 times Earth's, estimated from its size.
How much would you weigh on LP 791-18 b?
Someone who weighs 150 pounds on Earth would weigh about 198 pounds on LP 791-18 b.
How far is LP 791-18 b from Earth?
LP 791-18 b lies about 86.4 light-years from Earth.
How long would it take to get to LP 791-18 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 134,762 years.
How hot is LP 791-18 b?
LP 791-18 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 291°C (556°F).
How long is a year on LP 791-18 b?
LP 791-18 b completes one orbit of its star in 22.8 hours.
Illustration generated from LP 791-18 b's confirmed parameters, not a photograph.