To that end, a number of instruments designed to detect Earth-sized exoplanets have been considered, most notably NASA's Terrestrial Planet Finder (TPF) and ESA's Darwin programs, both of which have been cancelled.
Dǎɣ samando wen, iyyǎn hadi ən ilalan itwarnen fal asiknin exo təblulaɣen ən tebade ən nakal taqalat atiwǎnan, atamosan adabara ən TPF (Terrestrial Planet Finder) ən NASA əd adabara wǎn Darwin ən ESA, wi dak nasan atwakasan.