Fall 2019 - Volume 48, Number 4
Table of Contents
 Space News
A rundown of some of the most exciting developments in space and time.
 Cosmic Views, Jason Major
The solar system has a new dwarf planet and NASA continues to troubleshoot InSight’s mole woes.
 Passing Through, Steve Murray
Two interstellar travelers have visited the solar system in as many years—how many more are out there?
 The TMT: At an Impasse
As protests continue to stall construction of the Thirty Meter Telescope (TMT) on Hawaii’s Maunakea, where do we go from here?
 Perspectives, Ian O’Neill
A Spotlight on Hawai’i
 First Word, Linda Shore
The TMT: To Build or Not to Build
 Editor’s Journal, Ian O’Neill
The TMT: Science Lost
 Annals of Astronomy, Clifford J. Cunningham
Great Comet Confusion
 Astronomer’s Notebook, Jennifer Birriel
By the Light of Earth
 Armchair Astrophysics, Christopher Wanjek
 Education Matters, Brian Kruse
The TMT: It’s All a Matter of Perspective
 A Little Learning, C. Renee James
 Reflections, Ian O’Neill
Baby Stars Feed off Dusty Pretzel
Passing Through (Feature)
By Steve Murray
As giant planets orbit through the disks of young protoplanetary systems, their gravity can eject some pieces of disk material into interstellar space. Over the eons, chunks of planet-building debris (known as planetesimals) should have drifted through our galactic neighborhood, and astronomers have wondered where it was. All the asteroids and comets we had discovered to date seemed to be native to our solar system. Now, in the span of only two years, we’ve spotted two extrasolar visitors and a new analysis predicts that we can expect many more.
At an Impasse (Feature)
By Sarah Wells
Cold mountain winds whipped across hardened lava fields on July 15th as protestors bearing Hawaiian flags and winter coats took to the base of Hawaii’s sacred Maunakea to create a human barricade across the mountain’s single access road. Signs and banners reading “Protect Maunakea” and “Road Closed Due to Desecration” were held by both young and old kia’i, or protectors, taking a stand against what they believe to be the most recent in a long line of exploitative actions against Native Hawaiians: the building of the Thirty-Meter Telescope (TMT).
Say “Hi!” to Hygiea, the Smallest Dwarf Planet (Cosmic Views)
By Jason Major
This image, made from data captured with the SPHERE instrument on ESO’s Very Large Telescope (VLT), shows Hygiea, the fourth-largest object in the main asteroid belt. But more than just a random chunk of rock and rubble caught between Mars and Jupiter, Hygiea may very well become the newest member of the dwarf planet club.
Accessing Mercury Magazine
Published since 1972, Mercury Magazine is now published four times a year for ASP Members and Institutional Subscribers. The Mercury Archives offer a table of contents for each of the digital issues going back to 2007. Members and Subscribers have access to the complete digital library of the full magazines.
ASP Members simply Log In to access all full digital issues through the MyASP Portal.
Not an ASP Member? Join today to enjoy a full year subscription, an archive of digital issues since 2007, as well as other benefits.
Institutional Subscribers must access the full library of digital issues through your Institution.
Mercury now has a voice beyond its Members as we launch Mercury Online, featuring our recognized columnists, current space news, and more in a new and up-to-date blog format.
"We live in turbulent yet exciting times, so it is our hope that Mercury Online will showcase humanity's drive to explore by delivering high-quality articles for members and nonmembers alike." — Ian O'Neill, Editor, Mercury magazine and Mercury Online