- weight
- ≥ 1.14 g
- sun
- 4.0× wider
- sky
- dim red
Illustration computed from this world’s measured and derived values, not a photograph.
Ross 128 b
Ross 128 b is a confirmed rocky exoplanet 11.0 ly from Earth in the constellation Virgo, discovered in 2017 by La Silla Observatory.
Radial Velocity: spotted by the gravitational wobble the planet tugs in its star.
Standing on Ross 128 b, you would weigh roughly about 14% more than you do on Earth. Its red dwarf looks 4.0× 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 9.9 days, and at an estimated 28°C (82°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 · habitable zone
If your children grew up herea playful thought experiment
Gravity close to Earth's, at about 1.1 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 much as it does on Earth.
Assuming Earth-like air at this world's temperature of about 28°C (82°F), sound would travel close to its Earth speed, so your voice would sound much as it does on Earth. The real atmosphere is unknown.
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.
- Surface temperatures near 28°C (82°F) fall in the range where liquid water is at least possible.
- Surface gravity is close to Earth's, at least 1.14 times, so you would move much as you do here.
- A high Earth-similarity index of 0.87, among the more Earth-like worlds known.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of Ross 128 b’s measured and computed values, not a real advisory.
How long to get there · 11.0 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 Ross 128 b?
Ross 128 b's surface gravity is at least 1.1 times Earth's, and possibly more: its mass is only a lower bound.
How much would you weigh on Ross 128 b?
Someone who weighs 150 pounds on Earth would weigh at least 170 pounds on Ross 128 b.
How far is Ross 128 b from Earth?
Ross 128 b lies about 11.0 light-years from Earth.
How long would it take to get to Ross 128 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 17,165 years.
How hot is Ross 128 b?
Ross 128 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 28°C (82°F).
Is Ross 128 b habitable?
Ross 128 b orbits near its star's habitable zone, the range of distances where liquid water could be stable, and its Earth-similarity index is 0.87. That makes it worth studying, but it is not evidence of life: we have no measurement of its atmosphere, water, or surface.
How long is a year on Ross 128 b?
Ross 128 b completes one orbit of its star in 9.9 days.
Illustration generated from Ross 128 b's confirmed parameters, not a photograph.