Sky & Telescope - March 2025 - 30

KLAUS BRASCH
Astro Bio
SOUTHERN SPLENDOR The magnificent Eta Carinae Nebula (NGC 3372) in all its complexity as imaged by the author. The object is
located in the Carina-Sagittarius Arm of the Milky Way and had a special significance for Bart and Priscilla Bok.
Bart Bok's love affair with the Milky Way began when he
was a 12-year-old Boy Scout in the Netherlands, standing
guard at night over his troop of sleeping campers. Even as a
child the majestic sight overhead left a lasting impression.
In 1928 he was smitten a second time while attending the
International Astronomical Union (IAU) General Assembly in
Leiden, the Netherlands, where he met American astronomer
Priscilla Fairfield. Although 10 years Priscilla's junior (and
having known her for just a week), Bart proposed marriage in
a romantic setting - a bench in the Saint Germain-en-Laye
Gardens, near Paris, France. She accepted but insisted on a
year's wait. After surviving their long-distance relationship,
the couple were married in 1929 when Bok moved to Cambridge,
Massachusetts, to work with Harlow Shapley at Harvard
College Observatory, the nation's preeminent center of
astrophysics at the time and a vanguard training institution
30 MARCH 2025 * SKY & TELESCOPE
for many prominent women astronomers. The newlyweds
quickly became close collaborators.
In 1932, Bart completed his doctoral dissertation on
the Eta Carinae Nebula, one of the largest and most
active star-forming regions in the Milky Way. Lying some
7,500 light-years from us in the southern constellation of
Carina, French astronomer Nicolas-Louis de Lacaille first
observed the nebula in 1752 during a star-mapping expedition
to the Cape of Good Hope in South Africa. The huge
gaseous cloud of mostly ionized hydrogen (H II) with traces
of carbon oxides, helium, and silicate dust, houses many
massive young suns, including Eta Carinae - a star with
50 to 100 solar masses. Intense ultraviolet radiation from
these newborn stars ionizes the surrounding gas, causing it
to glow, while stellar winds disperse the material, creating
the dust nodules from which new star systems form. These

Sky & Telescope - March 2025

Table of Contents for the Digital Edition of Sky & Telescope - March 2025

Contents
Sky & Telescope - March 2025 - Cover1
Sky & Telescope - March 2025 - Cover2
Sky & Telescope - March 2025 - 1
Sky & Telescope - March 2025 - Contents
Sky & Telescope - March 2025 - 3
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Sky & Telescope - March 2025 - Cover3
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