- weight
- 3.33 g
- sun
- 3.6× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
GJ 143 b
GJ 143 b is a confirmed sub-Neptune exoplanet 53.2 ly from Earth in the constellation Reticulum, 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 GJ 143 b, you would weigh about 233% more than you do on Earth. Its orange dwarf looks 3.6× 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 36 days, and at an estimated 149°C (300°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
Heavier than home, at 3.3 times Earth's gravity. A child would end up markedly shorter and powerfully built, about 0.79x as tall as on Earth: a 5 ft 10 in adult could stand nearer 4 ft 7 in. Bones, muscle, and heart would all grow heavier just to stand and move.
- 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.
- Movement
- Low and deliberate
- A fall under this gravity lands hard, so movement stays slow, planted, and careful.
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 149°C (300°F), sound would travel roughly 21% 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 149°C (300°F), well above anything you would call comfortable.
- !Gravity is 3.3 times Earth's, so every movement is a strain and a fall could be fatal.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of GJ 143 b’s measured and computed values, not a real advisory.
How long to get there · 53.2 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 GJ 143 b?
GJ 143 b's surface gravity is about 3.3 times Earth's.
How much would you weigh on GJ 143 b?
Someone who weighs 150 pounds on Earth would weigh about 500 pounds on GJ 143 b.
How far is GJ 143 b from Earth?
GJ 143 b lies about 53.2 light-years from Earth.
How long would it take to get to GJ 143 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 83,016 years.
How hot is GJ 143 b?
GJ 143 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 149°C (300°F).
How long is a year on GJ 143 b?
GJ 143 b completes one orbit of its star in 36 days.
Illustration generated from GJ 143 b's confirmed parameters, not a photograph.