A nine-year-old boy from a primary school identified as Niu Ziru has written a letter to Chinese President Xi Jinping via a school project and he pondered his thoughts about a mission to Mars and advising "Grandpa Xi" to lose some weight.

The news was reported by the Zhengzhou Evening News in China and they said that the student is from the central Henan province and his insights were about the space program of China focusing on Mars as a possible habitat for people and his health tips for Xi.

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The student wrote, "Xi Dada, You could lose some weight. You don't have to look as slim as Obama. It's all right to look like Putin!" The letter was never sent to Xi but the student's father has posted it on a messaging app called Weixin, which has quickly become viral and a sensational message.

According to the South China Morning Post, the letter is not yet confirmed if it is authentic or not as the father who posted the photo of the letter alongside a photo of his son was not located yet. However, the Chinese government is said to be unamused about the trending topic.

The report and the story about the letter in Zhengzhou Evening News and even in the state-run media called Xinhua Agency have all been erased from the internet. Also, in Weibo, the microblog in China, the student's name has been censored or does not return any results. On Baidu, links to the story are also broken and cannot be accessed.

The letter was written in Chinese but was translated in English and the student first talked about the "next big challenge in space" in reference to the moon and Mars. The student said that although the moon is rich in minerals, it does not have air or water making it not suitable for human life.

He adds that the aerospace program of China should change directions and look at Mars as it has air and glaciers, which is also found on Earth. He adds that the United States, Russia, European Union and India are already gearing towards exploring Mars and he said that China should hurry up and be part of "joining in the fun".

Tags9-year-old boy, advise, lose weight, Obama, Putin, Mars, space probe