Medieval African science: The walls of Timbuktu, in Mali, West Africa Medieval African science In the 700s AD, the Islamic Empire conquered North Africa and began to trade a lot with East Africa. Islamic government did [...]
The sun from space The Sun is a star, just like billions of other stars in the universe. Our Sun probably formed a little more than four and a half billion years [...]
What are stars made of? This is just one of the stars: the sun from space The first stars The earliest stars probably formed only a few hundred thousand years [...]
Main sequence stars: A starry sky with the Milky Way galaxy (thanks to Bernd Nies) What is a main sequence star? Nine out of ten stars that you see in the sky [...]
The galaxy M 100, seen through the Hubble telescope What is a galaxy? A galaxy is a group of millions of stars that are relatively near each other. Most stars seem to [...]
Medieval Islamic science: Al Tusi's diagram of linear motion from circular motion Indian and African science In the Early Middle Ages, before the formation of the Islamic Empire, Buddhists ran the world's biggest [...]
Islamic astronomers taking observations West Asian astronomy before Islam West Asian astronomers had been world leaders in astronomy for thousands of years before the Islamic conquests in the 600s AD. In the last centuries BC, [...]
Al Tusi in his observatory (ca. 1259 AD) Nasir al Tusi was born in Iran in 1201 AD, as the Seljuk Empire was falling apart. The Seljuks were Turkic people. But al Tusi, [...]
