![International Space Station (ISS) crew members Serena Aunon-Chancellor of the U.S, Alexander Gerst of Germany and Sergey Prokopyev of Russia mark Halloween in this photo released November 1, 2018.(Photo/Agencies)](http://www.ecns.cn/hd/2018/11/02/910ea47a4f7d4df7aedbc67d201cf45e.jpg)
International Space Station (ISS) crew members Serena Aunon-Chancellor of the U.S, Alexander Gerst of Germany and Sergey Prokopyev of Russia mark Halloween in this photo released November 1, 2018.(Photo/Agencies)
![International Space Station (ISS) crew members Serena Aunon-Chancellor of the U.S, Alexander Gerst of Germany and Sergey Prokopyev of Russia mark Halloween in this photo released November 1, 2018. (Photo/Agencies)](http://www.ecns.cn/hd/2018/11/02/f3ffa145d3494d51afe1475908ce0f67.jpg)
International Space Station (ISS) crew members Serena Aunon-Chancellor of the U.S, Alexander Gerst of Germany and Sergey Prokopyev of Russia mark Halloween in this photo released November 1, 2018. (Photo/Agencies)
![International Space Station (ISS) crew member Sergey Prokopyev of Russia, dressed as Elvis Presley, marks Halloween in this photo released November 1, 2018. (Photo/Agencies)](http://www.ecns.cn/hd/2018/11/02/b6649fb6f81041fc8cb864f215c9ce0d.jpg)
International Space Station (ISS) crew member Sergey Prokopyev of Russia, dressed as Elvis Presley, marks Halloween in this photo released November 1, 2018. (Photo/Agencies)
![International Space Station (ISS) crew member Sergey Prokopyev of Russia, dressed as Elvis Presley, marks Halloween in this photo released November 1, 2018. (Photo/Agencies)](http://www.ecns.cn/hd/2018/11/02/04a6710d8f3245ca92c2731ba8e92f3f.jpg)
International Space Station (ISS) crew member Sergey Prokopyev of Russia, dressed as Elvis Presley, marks Halloween in this photo released November 1, 2018. (Photo/Agencies)