- weight
- ≈ 0.94 g
- sun
- 16.7× wider
- sky
- dim red
Illustration computed from this world’s measured and derived values, not a photograph.
SPECULOOS-3 b
SPECULOOS-3 b is a confirmed rocky exoplanet in the constellation Cygnus, discovered in 2024 by SPECULOOS Southern Observatory.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on SPECULOOS-3 b, you would weigh roughly about 6% less than you do on Earth. Its red dwarf looks 16.7× 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 17.3 hours, and at an estimated 280°C (536°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
Gravity close to Earth's, at about 0.94 times. A child would grow up much as they would back home.
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 280°C (536°F), sound would travel roughly 39% 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 280°C (536°F), far too hot for liquid water on the surface.
- Surface gravity is close to Earth's, about 0.94 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 SPECULOOS-3 b’s measured and computed values, not a real advisory.
How long to get there · distance unknown away
Distance unknown for this world.
No other confirmed planets here yet. New ones auto-appear as telescopes report.
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 SPECULOOS-3 b?
SPECULOOS-3 b's surface gravity is about 0.94 times Earth's, estimated from its size.
How much would you weigh on SPECULOOS-3 b?
Someone who weighs 150 pounds on Earth would weigh about 140 pounds on SPECULOOS-3 b.
How hot is SPECULOOS-3 b?
SPECULOOS-3 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 280°C (536°F).
How long is a year on SPECULOOS-3 b?
SPECULOOS-3 b completes one orbit of its star in 17.3 hours.
Illustration generated from SPECULOOS-3 b's confirmed parameters, not a photograph.