American astronomer, astrophysicist, cosmologist, author, science popularizer, and science communicator in astronomy and natural sciences. Author. Host of the popular TV series Cosmos

Astrophysicist and author. President of the Hayden Planetarium

American geologist and Professor of Geology and Geophysics at the California Institute of Technology. He is known for his work in the fields of cosmochemistry, meteoritics and astrophysics

Scientist; MIT; NASA. Principal investigator for the Gravity Recovery and Interior Laboratory (GRAIL) Mission (2011-2012); other planetary mission participation: NASA LRO, MRO, Dawn, NEAR, Mars Global Surveyor