- sun
- 7.7× wider
- sky
- warm white
Illustration computed from this world’s measured and derived values, not a photograph.
Kepler-37 b
Kepler-37 b is a confirmed rocky exoplanet 208 ly from Earth in the constellation Lyra, discovered in 2013 by Kepler.
★ Smallest known exoplanetThe smallest known exoplanet is Kepler-37 b, about 0.31 times the radius of Earth: between our Moon and Mercury in size.
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it (what that means).
Its yellow, Sun-like star looks 7.7× wider than ours, bathing the surface in warm white 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 13 days, and at an estimated 445°C (833°F) it is furnace-hot.
Catalog values (NASA Exoplanet Archive): mass 0.79 M⊕, radius 0.31 R⊕. Its catalog mass and radius imply a density of 146.4 g/cm³, denser than compressed iron, so they cannot both be right, and gravityfinder does not use Kepler-37 b in gravity rankings or weight calculations.
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
Hear how a voice sounds herea computed acoustic demoEXPERIMENTAL · just for fun
Your voice would sound high and thin, almost cartoonish.
Assuming Earth-like air at this world's temperature of about 445°C (833°F), sound would travel roughly 58% faster than on Earth, so your voice would sound high and thin, almost cartoonish. 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.
- !Furnace-hot at around 445°C (833°F), with no liquid water and no shade anywhere.
- !Earth-similarity index 0.17: this world has almost nothing in common with our own.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of Kepler-37 b’s measured and computed values, not a real advisory.
How long to get there · 208 ly awayCALCULATED
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
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How far is Kepler-37 b from Earth?
Kepler-37 b lies about 208 light-years from Earth.
How long would it take to get to Kepler-37 b?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 325,149 years.
How hot is Kepler-37 b?
Kepler-37 b's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 445°C (833°F).
How long is a year on Kepler-37 b?
Kepler-37 b completes one orbit of its star in 13 days.
Illustration generated from Kepler-37 b's confirmed parameters, not a photograph.