- weight
- 0.38 g
- sun
- 2.6× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
Mercury
Mercury is a rocky world in our own solar system.
Standing on Mercury, you would weigh about 62% less than you do on Earth. From here the Sun looks 2.6× wider than it does from Earth, bathing the surface in warm white light. A year passes in just 88 days, and at an estimated 167°C (332°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
Low gravity, 0.38 times Earth's. A child who grew up here could become strikingly tall and lightly built, about 1.2x taller than on Earth: a 5 ft 10 in adult could stand nearer 7 ft 1 in, with long limbs and slender bones.
- Bones
- Light and slender
- With little weight to carry, the growing skeleton lays down far less bone, the way astronauts' bones thin in months of low gravity.
- Heart
- Unhurried
- With less weight pulling blood down toward the feet, the heart has far less work to do.
- Movement
- Bounding and springy
- So little weight means each step would carry the body up and forward in long, floating strides.
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
You would hear nothing at all.
With essentially no atmosphere, there is no medium to carry sound. You could shout into someone's helmet from an inch away and they would hear nothing: space is silent.
- !The sunlit ground reaches about 430°C, while the night side plunges near -180°C.
- !Almost no atmosphere, and a brutal dose of unshielded solar radiation this close to the Sun.
- !Nowhere to hide: it bakes under a Sun three times wider than the one we see.
A playful read of Mercury’s measured and computed values, not a real advisory.
Mercury is in our own solar system. It orbits about 0.39 AU from the Sun, so sunlight reaches it in roughly 3 minutes. From Earth it is about 0.61 AU away at closest, and a spacecraft is far slower:
How long to get there with today’s craft
At the speed of the Parker Solar Probe, the fastest craft ever built, the trip to Mercury would take about 6 days; a real mission takes years: BepiColombo needs about 7, braking against the Sun's pull the whole way.
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 Mercury?
Mercury's surface gravity is about 0.38 times Earth's.
How much would you weigh on Mercury?
Someone who weighs 150 pounds on Earth would weigh about 57 pounds on Mercury.
How hot is Mercury?
Mercury's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 167°C (332°F).
How long is a year on Mercury?
Mercury completes one orbit of the Sun in 88 days.
The portrait of Mercury is a real photograph (NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington, Public domain). The "stand here" scene and the size comparison are computed illustrations, not photographs.