- weight
- ≥ 0.54 g
- sun
- 4.9× wider
- sky
- dim red
Illustration computed from this world’s measured and derived values, not a photograph.
Proxima Cen d
Proxima Cen d is a confirmed rocky exoplanet 4.2 ly from Earth in the constellation Centaurus, discovered in 2025 by La Silla Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on Proxima Cen d, you would weigh roughly about 46% less than you do on Earth. Its red dwarf looks 4.9× 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 5.1 days, and at an estimated 9°C (48°F) it is cold.
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 0.54 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 much as it does on Earth.
Assuming Earth-like air at this world's temperature of about 9°C (48°F), sound would travel close to its Earth speed, so your voice would sound much as it does on Earth. The real atmosphere is unknown.
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.
- Surface temperatures near 9°C (48°F) fall in the range where liquid water is at least possible.
- !Low gravity, at least 0.54 times Earth's, would hold only a thin, unbreathable atmosphere at best.
- A high Earth-similarity index of 0.83, among the more Earth-like worlds known.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of Proxima Cen d’s measured and computed values, not a real advisory.
How long to get there · 4.2 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 Proxima Cen d?
Proxima Cen d's surface gravity is at least 0.54 times Earth's, and possibly more: its mass is only a lower bound.
How much would you weigh on Proxima Cen d?
Someone who weighs 150 pounds on Earth would weigh at least 81 pounds on Proxima Cen d.
How far is Proxima Cen d from Earth?
Proxima Cen d lies about 4.2 light-years from Earth.
How long would it take to get to Proxima Cen d?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 6,619 years.
How hot is Proxima Cen d?
Proxima Cen d's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 9°C (48°F).
How long is a year on Proxima Cen d?
Proxima Cen d completes one orbit of its star in 5.1 days.
Illustration generated from Proxima Cen d's confirmed parameters, not a photograph.