Dr. Christiansen studies the evolution of volcanic landforms on the planets. He specifically focuses on low shield volcanoes on Syria Planum; evolution of Peneus and Amphrites Paterae by subvolcanic loading; volcanic debris flows and channels of the Elysium region; and large, near-surface volatile reservoirs in the northern hemisphere of Mars.
Dr. Radebaugh primarily researches three planetary satellites: Saturn's moon Titan, Jupiter's moon Io, and our own moon. Dr. Radebaugh works with scientists to understand the surface processes on Titan that form features such as dunes, mountains, lakes, rivers, and cryovolcanoes. She studies active volcanoes on Io, specifically the distribution and thermal output of volcanic eruptions from Galileo and Cassini images. Also, she and other scientists from BYU are preparing mass spectrometers for study of the lunar environment. Her research group has studied megadunes in the Sahara, Arabia, and Namibia; and lava lakes and lava flows in Hawaii, Ethiopia, and Vanuatu.