Dark energy, explained
Coined by University of Chicago astrophysicist Michael Turner in 1998, dark energy—the force causing the universe to expand faster over time—remains one of the great mysteries of physics.
Michael D. Gladders
Title: Professor, Department of Astronomy and Astrophysics; and the College
Expertise: Cosmology
Departmental Website: https://astro.uchicago.edu/people/michael-d-gladders.php
The Hubble constant, explained
One of the most important numbers in cosmology, the Hubble constant tells us how fast the universe is expanding, which in turn tells us the age of the universe and its history.
Alex Drlica-Wagner
Title: Assistant Professor of Astronomy and Astrophysics
Expertise: Dark Energy and Dark Matter, Dark matter, Cosmology, Particle physics
Departmental website : https://astro.uchicago.edu/people/alex-drlica-wagner.php