Shannon Hall

Contributing Writer

Rosaly Lopes above one of the lava lakes at Ambrym, an exceptionally active volcano in the Pacific island nation of Vanuatu.
Q&A

To Understand Volcanoes on Other Worlds, Stand On Our Own

Rosaly Lopes has visited dozens of active volcanoes on Earth and discovered even more elsewhere in the solar system. Her work is helping to establish whether volcanoes on distant moons could create conditions friendly to life.

Illustration of a hanging mobile with "Planet 9" weighing down 2015 BP519's orbit, thus tilting it.
planetary science

A New World’s Extraordinary Orbit Points to Planet Nine

Astronomers argue that there’s an undiscovered giant planet far beyond the orbit of Neptune. A newly discovered rocky body has added evidence to the circumstantial case for it.

About the author

Shannon Hall is a freelance science journalist based in the Rocky Mountains. She has bachelor’s degrees in astrophysics and philosophy and master’s degrees in astrophysics and science reporting. Her work has appeared in Scientific AmericanThe New York Times, National Geographic, Nature, Discover, Sky & Telescope, New Scientist and other publications.