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Earlier this year, China achieved a new milestone(里程碑) in space exploration(探索). On Jan. 3, Chang’e 4 became the first space probe(探测器) in history to land on the far side of the moon, People’s Daily reported.

From the Earth, we can only see one side of the moon. The other side has been a mystery. Scientists have long wondered what has on this side of the moon.

Chang’e 4 has sent back photos of the far side of the moon. It is also used to carry out experiments, such as growing seeds in a low gravity(低重力) environment. The data(数据) collected from these experiments could be used to help us build a base on the moon in the future.

The success of the Chang’e 4 mission(任务) is a main achievement for China’s space program. It marks a new stage in China’s deep space exploration, said Wu Yanhua, head of China National Space Administration.

China launched(启动) its lunar(月球的) exploration program in 2004, naming it Chang’ e. Chinese scientists set three goals—orbiting(环绕运行), landing and sample returning— referring to launching probes that could circle around the moon, touch down on its surface and bring lunar materials back to the Earth.

Chang’e 4 has realized the goal of landing. The third will be achieved during the Chang’e 5 mission, which is set to take place before the end of this year, China Daily reported.

Following the success of the Chang’e missions, Chinese scientists are looking even farther into our solar system(太阳系). China’s first Mars(火星) mission expected to be carried out by 2020, Wu said.

1．What is the new milestone in space exploration this year?
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2．What is the data collected from the experiments used to do?
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3．What does the underlined word “It” refer to in Paragraph 4?
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4．How many goals were set in China’s lunar exploration program? What are they?
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5．What is Chang’e 5 expected to do?
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