A few current items, including some press coverage of my work and some of my presentations to non-specialist audiences, appear below.
India's Mars Orbiter Mission
Ars Technica, October 2019
Planet Nine/X, revised
Le Figaro, France, March 2019
Pluto and Charon's craters
PBS Nova, February 2019
On the Kuiper Belt and New Horizons' flyby of Ultima Thule
New York Times, December 2018
The Faint Young Sun/Warm Young Earth Paradox: Did our ancient Sun go on a diet?
Science, December 2018
An extra-solar asteroid co-orbiting with Jupiter?
Sky and Telescope, May 2018
A curious warp of the mid-plane of the Kuiper Belt
UA News, June 2017
New Scientist, June 2017
Arizona Daily Star, June 2017
Newsweek, June 2017
Universe Today, June 2017
BloombergView had some sci-fi fun with this work! (June 2017)
More evidence for ninth planet roaming Solar System's outer fringes
Los Angeles Times, 22 October 2016
The Guardian, 19 October 2016
Science Daily, 19 October 2016
Science News for Students, August 1, 2016
The Planetary Society, March 8, 2016
FiveThirtyEight, January 22, 2016
Seasonal Variation of Impacts on Mars
Travelers In The Night, show by Dr. Al Grauer at www.spreaker.com
An Update on Planet Nine
Susanna Kohler, AAS-NOVA, 24 June 2016
On the hunt for a mystery planet
Alexandra Witze, Nature, 15 March 2016
Galaxy may teem with planets
Arizona Daily Star, January 27, 2016
Exploring our Solar System's Past Through Pluto (podcast)
Arizona Science, Episode 10, January 2016
Pluto, the Kuiper belt and the Early History of the Solar System (youtube)
SETI Institute Talks, July 2015
How often do Earth and Mars encounter Oort Cloud comets,
such as Mars' encounter with Comet Siding Spring on October 19, 2014?
Click here for the answer (PDF)
Weird orbit puzzles, fascinates astronomers
Arizona Daily Star, July 2015
"Baby photos of a scaled-up solar system"
UA News, November 2014
"A distant planet may lurk far beyond Neptune"
Science News, November 2014
"Kuiper Belt Missions Could Reveal the Solar System's Origins"
Scientific American, October 2014
"Structure and Evolution of the Solar System" (QuickTime)
Presentation at the UA Osher Lifelong Learning Institute, October 2014
"Our Solar System: It All Began in Chaos"
National Geographic Magazine, July 2013
"On Excellence" (PDF)
Keynote speech for UA College of Science Honors Convocation, October 2012
"Slow-moving rocks provide better odds that life crashed to Earth from space"
UA News, September 2012
"The Early History of the Solar System" (QuickTime)
Biosphere 2, October 2011
What Would Happen If Earth and Mars Switched Places?
Scientific American, blog by George Musser, June 2011
Women In Planetary Science Blog-"51 Women in Planetary Science"
interview by Kathryn Gardner-Vandy, April 2011
"The Solar system in Time" (QuickTime)
Golden Jubilee Conference on Women in Science & Technology, IIT-Delhi, March 2011
"Migrating Planets" (QuickTime)
LPL Evening Lecture, September 2009
"On the importance of a few dwarf planets" (QuickTime)
AAS Meeting, June 2009
"Planetary scattering and migration: lessons from Pluto" (QuickTime)
The Great Planet Debate, Baltimore, MD, August 2008