Visitors walk into a "black hole" at the newly-unveiled Shanghai Astronomy Museum on July 18, 2021. The museum, the world's largest planetarium in terms of building scale, opened on July 17. (Photo: chinadaily.com.cn)

People visit the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

Visitors take photos of the "sun" at the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

Children touch the "sun" at the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

A bird's-eye view of the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

A child observes the microstructure of a meteorite at the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

Visitors learn about gravitational wave at the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

Visitors rest under the dome theater at the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

A model of Yutu-2 lunar rover is on display at the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)

Visitors line up in front of the Shanghai Astronomy Museum on July 18, 2021. (Photo: chinadaily.com.cn)