- weight
- ≥ 0.77 g
- sun
- 5.1× wider
- sky
- amber-orange
Illustration computed from this world’s measured and derived values, not a photograph.
HD 177830 c
HD 177830 c is a confirmed Neptune-like exoplanet 205 ly from Earth in the constellation Lyra, discovered in 2010 by W. M. Keck Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
HD 177830 c is a giant ball of gas with no solid surface to stand on; you would simply sink into ever-thicker cloud. Its orange dwarf looks 5.1× wider than ours, bathing the cloud tops in amber-orange light. A year passes in just 111 days, and at an estimated 266°C (510°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 about 0.8 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 1,652 metres per second, 4.9 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 266°C (510°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 HD 177830 c’s measured and computed values, not a real advisory.
How long to get there · 205 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 HD 177830 c?
HD 177830 c is a gas giant with no solid surface to stand on. At its cloud tops, gravity pulls at least 0.77 times as hard as Earth's.
How far is HD 177830 c from Earth?
HD 177830 c lies about 205 light-years from Earth.
How long would it take to get to HD 177830 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 319,283 years.
How hot is HD 177830 c?
HD 177830 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 266°C (510°F).
How long is a year on HD 177830 c?
HD 177830 c completes one orbit of its star in 111 days.
Illustration generated from HD 177830 c's confirmed parameters, not a photograph.