To Ancient Astronomers, Theta Eridani Was Brighter For A Thousand Years. Now We Know Why

Ptolemy and al-Sufi were keen ancient astronomers, one in Greece and one in Persia, whose observations were separated by almost a thousand years. They both noted that the star Theta Eridani was far brighter than it is today. Now we know why.

Quelle: Originalartikel öffnen