Japan plans to collect dust from a moon of Mars . Mars has two small moons called Phobos and Deimos . It may reach Phobos in August 2027 . The spacecraft will bring samples back to Earth . Scientists want to learn how these moons formed . The spacecraft will study Deimos before exploring Phobos . A small rover will explore the surface of Phobos . Landing is difficult because Phobos has very weak gravity . The spacecraft hopes to collect ten grams of dust . The dust may help scientists learn more about Mars .

Phrases:

expected to . 被預期 . focus on . 專注於 . may be . 可能 . small amount . 少量 . will be . 將會 .