List of Cosmologists - A

A

• Tom Abel (1970–) studied primordial star formation
• Roberto Abraham (1965–) studied the shapes of early galaxies
• Hannes Alfvén (1908–1995) theorized that galactic magnetic fields could be generated by plasma currents
• Ralph A. Alpher (1921–2007) argued that observed proportions of hydrogen and helium in the universe could be explained by the big bang model, predicted cosmic background radiation
• Aristarchus of Samos (310–230 BC) was an early proponent of heliocentrism
• Aristotle (circa 384–322 BC) posited a geocentric cosmology that was widely accepted for many centuries
• Aryabhata (476–550) described a geocentric model with slow and fast epicycles