What Is Earth? | NASA
Planet Earth facts and information
Spherical Earth - Wikipedia
The earth is round! - The Journal of Thoracic and Cardiovascular Surgery
Who first Knew the Earth was Round?
Spherical Earth - Wikipedia
MYTH: Columbus set out to prove the earth was round. - CSMonitor.com
5 Questions About Believing In A Flat Earth That You Were Afraid To Ask | Colorado Public Radio
Eratosthenes - Wikipedia
Even a Kid Can Prove the Earth Is Round: Here's How | Space
Flat Earth - Wikipedia
Rapper B.o.B Is Trying to Launch a Satellite to Show the Earth Is Flat | Live Science
Who first Knew the Earth was Round?
Muslim scholars knew that the Earth was round
Strange but True: Earth Is Not Round - Scientific American
Who Discovered The Earth is Round? | ScienceBlogs
Is Earth flat? No, but you won't convince flat earthers with science — Quartz
This Month in Physics History
Opinion | What Did Plato Think the Earth Looked Like? - The New York Times
Who first Knew the Earth was Round?
This Month in Physics History
How Aryabhata got the earth's circumference right
Round Earth Clues: How Science Proves that our Home is a Globe
What Is Earth? | NASA
Why do some people believe the Earth is flat? | Pursuit by The University of Melbourne
