近年来，天文学家已经发现了近400颗新的有行星的恒星。
In recent years, astronomers have found nearly 400 new planets with stars.
火星是一颗行星，是离太阳第四近的行星。
Mars is a planet and is the fourth closest planet to the Sun.
虽然观测人员花费了大约15年确认了目前所探测到的近500颗行星，但是新的行星发现的速度一定会更快。
Although it has taken investigators roughly 15 years to confirm the detection of the nearly 500 planets known so far, the pace promises to pick up rapidly.
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