- weight
- 1.04 g
- sun
- 2.5× wider
- sky
- dim red
Illustration computed from this world’s measured and derived values, not a photograph.
TRAPPIST-1 g
TRAPPIST-1 g is a confirmed rocky exoplanet 40.5 ly from Earth in the constellation Aquarius, discovered in 2017 by Multiple Observatories.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on TRAPPIST-1 g, you would weigh about 4% more than you do on Earth. Its red dwarf looks 2.5× 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 12 days, and it sits squarely in the habitable zone, among the more Earth-like worlds known.
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 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 deeper and fuller.
Assuming Earth-like air at this world's temperature of about -76°C (-105°F), sound would travel roughly 17% slower than on Earth, so your voice would sound deeper and fuller. 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.
- !Cold at about -76°C (-105°F), survivable only fully suited and heated.
- Surface gravity is close to Earth's, 1.04 times, so you would move much as you do here.
- A high Earth-similarity index of 0.80, among the more Earth-like worlds known.
- It orbits within the habitable zone, where a world could in principle hold liquid water.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of TRAPPIST-1 g’s measured and computed values, not a real advisory.
How long to get there · 40.5 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 TRAPPIST-1 g?
TRAPPIST-1 g's surface gravity is about 1.0 times Earth's.
How much would you weigh on TRAPPIST-1 g?
Someone who weighs 150 pounds on Earth would weigh about 155 pounds on TRAPPIST-1 g.
How far is TRAPPIST-1 g from Earth?
TRAPPIST-1 g lies about 40.5 light-years from Earth.
How long would it take to get to TRAPPIST-1 g?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 63,228 years.
How hot is TRAPPIST-1 g?
TRAPPIST-1 g's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about -76°C (-105°F).
Is TRAPPIST-1 g habitable?
TRAPPIST-1 g orbits inside its star's habitable zone, the range of distances where liquid water could be stable, and its Earth-similarity index is 0.80. 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 TRAPPIST-1 g?
TRAPPIST-1 g completes one orbit of its star in 12 days.
Illustration generated from TRAPPIST-1 g's confirmed parameters, not a photograph.