Duba zuwa sashi na ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar sashi: Passage: Kamar yadda yake tare da mafi yawan abubuwan da aka gano na duniya a waje da hasken rana har yanzu, an samo shi ta hanyar gano ƙananan canje-canje a cikin saurin radial na tauraron da yake kewaye da shi, wanda ya haifar da jan hankalinsa. Nazarin saurin radial na HD 217107 da aka gudanar a shekarar 1998 ya nuna cewa motsinsa tare da layin gani ya bambanta a cikin zagaye na kwanaki 7.1. Lokaci da faɗin wannan bambancin ya nuna cewa wani abokin duniya ne ya haifar da shi a cikin kewayen tauraron, tare da mafi ƙarancin taro fiye da na Jupiter. Matsakaicin nisa na duniya daga tauraron bai kai kashi ɗaya cikin biyar na nesa na Mercury daga Sun ba. Tambaya: Yaushe aka gudanar da binciken saurin radial?
Shekara ta 1998