- weight
- 1.05 g
- sun
- 15.0× wider
- sky
- deep orange
Illustration computed from this world’s measured and derived values, not a photograph.
GJ 3634 b
GJ 3634 b is a confirmed sub-Neptune exoplanet 66.5 ly from Earth in the constellation Hydra, discovered in 2010 by La Silla Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on GJ 3634 b, you would weigh about 5% more than you do on Earth. Its red dwarf looks 15.0× wider than ours, bathing the surface in deep 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 2.6 days, and at an estimated 383°C (722°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 1.0 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 383°C (722°F), sound would travel roughly 51% 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 383°C (722°F), far too hot for liquid water on the surface.
- Surface gravity is close to Earth's, 1.05 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 GJ 3634 b’s measured and computed values, not a real advisory.
How long to get there · 66.5 ly away
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 GJ 3634 b?
GJ 3634 b's surface gravity is about 1.0 times Earth's.
How much would you weigh on GJ 3634 b?
Someone who weighs 150 pounds on Earth would weigh about 157 pounds on GJ 3634 b.
How far is GJ 3634 b from Earth?
GJ 3634 b lies about 66.5 light-years from Earth.
How long would it take to get to GJ 3634 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 103,657 years.
How hot is GJ 3634 b?
GJ 3634 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 383°C (722°F).
How long is a year on GJ 3634 b?
GJ 3634 b completes one orbit of its star in 2.6 days.
Illustration generated from GJ 3634 b's confirmed parameters, not a photograph.