HAMPTON, Va. — Most of the universe remains mysterious to scientists and researchers everywhere. More than 90 percent of the universe is “dark,” composed of dark energy and dark matter observed only by their gravitational interaction with both light and “normal” matter.

Understanding the nature of dark energy and matter is one of the most significant challenges in science — one that researcher Salman Habib and his team at the Los Alamos National Laboratory in New Mexico are working to overcome.

“The twin mysteries of dark energy and dark matter are driving the development and refinement of cosmological observations to remarkable levels,” Habib said.

Habib, who leads the Astrophysics and Cosmology Center at Los Alamos, will speak Tuesday, Feb. 10, on the “twin mysteries” and recent developments in the field of cosmology. The talk, entitled “The Dark Universe Challenge,” will take place at 2 p.m. in the Reid Conference Center at NASA Langley.

Media who wish to interview Habib at a news briefing at 1:15 p.m. Tuesday should contact Emily Outen at 864-7022 or at emily.s.outen@nasa.gov by noon for credentials and entry to NASA Langley.

Habib will present the same lecture for the general public on Tuesday evening at 7:30 p.m. at the Virginia Air & Space Center on Settlers Landing Road in Hampton. The evening talk is free and no reservations are required.

The Los Alamos National Laboratory, a United States Department of Energy national laboratory, is one of the largest science technology organizations in the world. Los Alamos conducts research in the fields of national security, space, renewable energy, medicine, nanotechnology and supercomputing.