The oldest star chart in the world was made in China more than 2,300 years ago, a hotly debated preprint study finds. Researchers at the Chinese National Astronomical Observatories analyzed the "Star ...

On the low end, the UN estimates the year 2300 will see only 2.3 billion people walking the Earth, fewer than we saw in 1940. On the high end, it predicts 36 billion — five times the current size.

Credit: CPA Media Pte Ltd via Alamy The oldest star chart in the world was made in China more than 2,300 years ago, a hotly debated preprint study finds. Researchers at the Chinese National ...

They found that the ancient star chart actually dates to 355 B.C. — 250 years earlier than previously thought — and that it was later updated around A.D. 125.