- weight
- 63.81 g
- sun
- 0.01× as wide
- sky
- dim red
Illustration computed from this world’s measured and derived values, not a photograph.
WISEP J121756.91+162640.2 A b
WISEP J121756.91+162640.2 A b is a confirmed gas-giant exoplanet 32.9 ly from Earth in the constellation Coma Berenices, discovered in 2012 by W. M. Keck Observatory.
Imaging: photographed directly, as a faint point of light beside its star.
WISEP J121756.91+162640.2 A b is a giant ball of gas with no solid surface to stand on; you would simply sink into ever-thicker cloud. Its red dwarf looks 0.01× as wide as ours, bathing the cloud tops in dim red light. At an estimated 177°C (350°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
There is no ground here to grow up on, only bottomless sky. A child could never stand, walk, or even fall to a surface, because there isn't one. Under 63.8 times Earth's gravity and pressure that only climbs the deeper you go, anything built for this world would not look human at all: picture something closer to a deep-sea creature than a person, broad and buoyant, drifting through the cloud decks with no need for legs and no floor to land on.
- Body plan
- Floating, not upright
- With no surface and no fixed up or down, a skeleton built for standing would be useless; a drifting, gas-filled body would not.
- Build
- Broad and pressure-hardened
- Pressure rises without limit toward the interior, so anything alive would have to be built like a deep-sea animal, not a land one.
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 a thin, helium-fast squeak.
There is no surface to stand on; this is the sound at the cloud tops, where the air is mostly hydrogen and helium, the lightest gases there are. Sound races through them at about 1,509 metres per second, 4.4 times its Earth speed, flipping a voice into a thin, cartoon-helium squeak. The temperature behind that number is this world's computed equilibrium temperature; its real atmosphere is unknown. The demo plays the shift capped at 1.8x; the real effect would be even stronger.
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 177°C (350°F), far too hot for liquid water on the surface.
- !There is nowhere to land: no ground, no deck, only cloud that thickens into crushing pressure.
A playful read of WISEP J121756.91+162640.2 A b’s measured and computed values, not a real advisory.
How long to get there · 32.9 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.
What is the gravity on WISEP J121756.91+162640.2 A b?
WISEP J121756.91+162640.2 A b is a gas giant with no solid surface to stand on. At its cloud tops, gravity pulls about 64 times as hard as Earth's.
How far is WISEP J121756.91+162640.2 A b from Earth?
WISEP J121756.91+162640.2 A b lies about 32.9 light-years from Earth.
How long would it take to get to WISEP J121756.91+162640.2 A b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 51,376 years.
How hot is WISEP J121756.91+162640.2 A b?
WISEP J121756.91+162640.2 A b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 177°C (350°F).
Illustration generated from WISEP J121756.91+162640.2 A b's confirmed parameters, not a photograph.