TIE fighter
"Deep Space 1" was the first NASA's spacecraft to use ion propulsions, with comparisons made directly between it and the Empire's TIE Fighter. According to NASA, while their means of propulsion were the same, advances in power generation would be needed to in order to develop an ion engine as powerful as those used on TIE fighters. The space probe "Dawn" also uses ion propulsion, although unlike the TIE fighter it was fitted with three instead of just two.