- weight
- ≥ 1.03 g
- sun
- 4.0× wider
- sky
- deep orange
Illustration computed from this world’s measured and derived values, not a photograph.
GJ 685 b
GJ 685 b is a confirmed sub-Neptune exoplanet 46.7 ly from Earth in the constellation Draco, discovered in 2019 by Roque de los Muchachos Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on GJ 685 b, you would weigh roughly almost exactly what you weigh on Earth. Its orange dwarf looks 4.0× 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 24 days, and at an estimated 96°C (204°F) it is warm.
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 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 noticeably higher and reedier.
Assuming Earth-like air at this world's temperature of about 96°C (204°F), sound would travel roughly 13% 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 96°C (204°F), well above anything you would call comfortable.
- Surface gravity is close to Earth's, at least 1.03 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 685 b’s measured and computed values, not a real advisory.
How long to get there · 46.7 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.
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What is the gravity on GJ 685 b?
GJ 685 b's surface gravity is at least 1.0 times Earth's, and possibly more: its mass is only a lower bound.
How much would you weigh on GJ 685 b?
Someone who weighs 150 pounds on Earth would weigh at least 155 pounds on GJ 685 b.
How far is GJ 685 b from Earth?
GJ 685 b lies about 46.7 light-years from Earth.
How long would it take to get to GJ 685 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 72,819 years.
How hot is GJ 685 b?
GJ 685 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 96°C (204°F).
How long is a year on GJ 685 b?
GJ 685 b completes one orbit of its star in 24 days.
Illustration generated from GJ 685 b's confirmed parameters, not a photograph.