![]() The United Nations projects India will add over 400 million urban dwellers by 2050, compared to 250 million people in China and 190 million in Nigeria. The first non-Chinese city, Delhi, has been experiencing one of the fastest urban expansions in the world. Other Chinese cities dominate the ranking by this metric: Rank Additionally, the city ranks among the globe’s top 50 hubs for scientific research. Chongqing Jiangbei International Airport, is among the world’s top 50 busiest airports. The city’s monorail system holds records for being the world’s longest and busiest, boasting 70 stations. The Chinese city of Chongqing leads the ranks by this metric and has an administrative boundary the size of Austria, with an urban population of 32.1 million. Our first metric is based on the city proper, meaning the administrative boundaries.Īccording to the United Nations, a city proper is “the single political jurisdiction which contains the historical city center.” The graphic above uses data taken from the latest official censuses and projections to rank the top cities based on the three most common metrics. Today, more than 4.3 billion people live in urban settings, or 55% of the world’s population.īut what is the world’s largest city? Answers to that question will vary greatly depending on which lines are being used to demarcate city boundaries and measure their populations. The world has experienced rapid urbanization over the last century. Ranked: The World’s Largest Cities By Population Another well-known scientist was Edwin Hubble, whose findings of galaxies moving away from Earth is considered to be the first observation of the universe expanding. Most people are familiar with Albert Einstein and his theory of relativity, which became a cornerstone of both physics and astronomy. Humanity has been interested in space for thousands of years, and many scientists and researchers have dedicated their lives to furthering our collective knowledge about space and the universe. Why is it called the “Observable” Universe? It also highlights some newly deployed spacecraft, including the James Webb Space Telescope (JWST), which is NASA’s latest infrared telescope, and the Tiangong Space Station, which was made by China and launched in April 2021. Scientists believe this newly-discovered galaxy was formed just 330 million years after the Big Bang, or roughly 8.4 billion years before Earth. Cosmic microwave background-radiation leftover from the Big Bangįeatured are some recently discovered objects, such as the most distant known galaxy to date, HD1.
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