description TOI-700 d Overview
TOI-700 d is an Earth-sized exoplanet discovered in 2020 using data from NASA's Transiting Exoplanet Survey Satellite (TESS). It orbits a nearby red dwarf star within its conservative habitable zone, a region where liquid water could theoretically exist on the surface. The planet is tidally locked to its host star, meaning one side is in permanent daylight while the other is in constant darkness. It remains a prominent target for future astronomical observations to determine its atmospheric composition and potential habitability.
help TOI-700 d FAQ
Why is TOI-700 d considered potentially habitable?
It is roughly Earth-sized and orbits within the temperate zone where liquid water could exist under suitable atmospheric conditions. Habitability remains unconfirmed because its atmosphere and surface composition have not been established.
How long is a year on TOI-700 d?
TOI-700 d takes about 37 days to orbit its red-dwarf host. The planet receives considerably less intense light than it would at the same distance from the Sun because TOI-700 is smaller and cooler.
How did TESS discover TOI-700 d?
NASA's Transiting Exoplanet Survey Satellite detected periodic dips in TOI-700's brightness. Those transits reveal the planet's orbital period and allow astronomers to estimate its radius.
Is TOI-700 d the only potentially temperate planet in its system?
No. Scientists later identified TOI-700 e, another approximately Earth-sized planet near the system's habitable zone, with an orbit of about 28 days.
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