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Planet profiles

TOI-700 e

Earth Like · 101 light-years away · Last reviewed October 15, 2026

TOI-700 e rendered in TerraForge from its measured mass, orbit and star
TerraForge's rendering of TOI-700 e, generated by our physics engine from its measured mass, size, orbit and star. An illustration of what the science suggests, not a photograph.
TerraForge classification
Earth Like
Host star
TOI-700 (M2.5 V)
Distance
101 light-years
Orbit
27.8 days
Mass
0.72 × Earth
Radius
0.92 × Earth
Discovered
2023, transit

Figures from the NASA Exoplanet Archive. The classification is TerraForge’s, from its physics model.

TOI-700 e is an Earth-sized planet in the habitable zone of TOI-700, a calm red dwarf about 100 light-years away. The habitable zone is the range of distances where a planet could keep liquid water on its surface. TOI-700 e is about 95 percent of Earth's width, which makes it likely to be rocky, and it orbits every 27.8 days.

It is the fourth known planet in the system and the second in the habitable zone, after TOI-700 d, which NASA's TESS satellite found in 2020. A team led by Emily Gilbert announced TOI-700 e in 2023. TESS finds planets by catching the small dip in starlight as one crosses its star, and this signal was so faint that it took an extra year of observations to detect; the team used 21 sectors of TESS data over the mission's first and third years. TOI-700 e orbits between planets c and d.

Its place in the habitable zone comes with a qualifier. TOI-700 d sits in the conservative habitable zone, where liquid water could last for most of a planet's life. TOI-700 e is in the optimistic habitable zone, a wider range that assumes a planet could hold surface water for at least part of its history. Like its sibling, it is probably tidally locked, with one side always facing the star. Its mass has not been measured, so whether it is rocky is inferred from its size, and nothing is yet known about any atmosphere. The discovery team noted that the star is inactive and bright enough for future telescopes to try to measure the planets' masses and atmospheres, and that two small habitable-zone planets around one star make the system especially valuable to study.

Sources

  1. A Second Earth-Sized Planet in the Habitable Zone of the M Dwarf, TOI-700 — arXiv (The Astrophysical Journal Letters)
  2. NASA's TESS Discovers Planetary System's Second Earth-Size World — NASA Jet Propulsion Laboratory
A banded gas giant with four moons in different colors: a yellow sulfur moon, two rust-red rock moons and a blue water moon

New: Choose What Your Moons Are Made Of 🌙

Every moon used to be grey rock, white ice or blue ocean, decided for you. Now each one has a "Made of" choice in the builder's Moons tab — silicate rock, iron, water ice, carbon, sulfur, or nitrogen and methane ice — and the physics decides what that becomes. Put water ice too close to the star and it boils off to bare rock. Put sulfur where a neighbouring moon keeps it tidally flexed and it erupts in Io's yellows. Give a Titan-sized moon nitrogen ice far from the sun and it wraps itself in haze. Hang a water moon about the mass of Earth off a giant planet in the habitable zone and it can hold air and open seas — scored for life on the same scale as a planet, with a day as long as its orbit. A tint slider nudges the colour, but only as far as that material could really go.

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