Comets

To watch a comet form, a spacecraft could tag along for a journey toward the sun color photograph of comet with long tail with stars in background

To watch a comet form, a spacecraft could tag along for a journey toward the sun

Mysterious interstellar visitor was probably a ‘dark hydrogen iceberg,’ not aliens Oumuamua

Mysterious interstellar visitor was probably a ‘dark hydrogen iceberg,’ not aliens

Fred Ciesla

Fred Ciesla

Title: Professor in Geophysical Sciences

Expertise: Asteroids and meteorites, Astronomy and Astrophysics, Comets, Planetary science, Theoretical modeling

Personal website: http://geosci.uchicago.edu/~fciesla/index.html