Finding Earth 2.0
Exoearth evidence observatory · missions

Different observatories answer different questions

JWST, HWO, ANDES, PLATO, Gaia and Roman are not interchangeable rows in one score. Each desk states what the mission can measure, what evidence is public now, and where a forecast begins.

Status checked 2026-09-12 · six versioned adapters

6

mission desks

separate scientific roles

4

with observed evidence

current public products

2

forecast-only or mixed

status remains visible

2026-09-12

status date

official sources checked

Six separate instruments

Mission desk

NASA / ESA / CSA

James Webb Space Telescope

operational observatory; public atmospheric reductions available

OBSERVEDDERIVED

Existing and planned infrared atmospheric characterisation

Can measure

  • wavelength-dependent transit and eclipse depths
  • direct spectra and images of sufficiently bright, widely separated companions
  • time-series spectrophotometry constrained by instrument modes and target brightness

Cannot establish alone

  • life or habitability from a spectrum alone
  • a unique atmospheric composition without retrieval assumptions and degeneracy tests
  • Earth-Sun analogues in reflected light at HWO-like angular separation and contrast
OBSERVED

396

separate spectrum reductions

Published reductions whose archive facility names JWST; reductions are not merged.

DERIVED

0

reductions with programme status

The pinned NASA Archive spectrum table does not provide complete programme IDs or planned/approved/scheduled states.

The observatory records published reductions as observations. Scale-height signals and unexecuted programme states remain scenarios or forecasts.