Asaph Hall's Discovery: Mars Reveals Its Twin Companions

On August 12th in Science History, a significant event occurred in 1877 when the American astronomer Asaph Hall discovered the two moons of Mars, Phobos and Deimos, at the U.S. Naval Observatory in Washington, D.C.

Hall had been observing Mars for some time, looking for any potential moons orbiting the planet. On the night of August 12th, he was using a 26-inch telescope, which was one of the largest in the world at the time. After several nights of careful observation, he finally spotted what appeared to be a small, faint object near Mars.

Initially, Hall was uncertain whether he had actually discovered a moon or if it was just a star or some other celestial object. However, after observing it for several more nights, he confirmed that the object was indeed orbiting Mars and that it was not just one moon, but two.

Hall named the moons Phobos and Deimos, after the Greek mythological twin characters who accompanied their father Ares, the god of war, into battle. The names were fitting because Mars was named after the Roman god of war, and its two moons appeared to be his loyal companions.

The discovery of Phobos and Deimos was a significant milestone in the field of astronomy and planetary science. It marked the first time that moons had been discovered orbiting another planet besides Earth, and it provided valuable insights into the formation and evolution of the solar system.

Since their discovery, Phobos and Deimos have been the subject of numerous scientific studies and missions. In 1969, the Mariner 7 spacecraft flew by Mars and captured the first close-up images of the two moons. In 2024, just a year before the date mentioned in the prompt, NASA plans to launch the Martian Moons eXploration (MMX) mission, which will study both Phobos and Deimos in detail and even attempt to collect samples from Phobos to bring back to Earth.

The discovery of Phobos and Deimos on August 12th, 1877, by Asaph Hall was a groundbreaking achievement in the history of astronomy and planetary science. It opened up a whole new realm of possibilities for exploring and understanding our solar system, and it continues to inspire scientists and researchers to this day.


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Episode Transcript

Speaker 1 (00:00):
Welcome to This Moment in Science History podcast on August twelfth.
In science history, a significant event occurred in eighteen seventy
seven when the American astronomer Assof Hall discovered the two
moons of Mars, Phobos and Damos, at the U. S
Naval Observatory in Washington, d C. Hall had been observing

(00:21):
Mars for some time looking for any potential moons orbiting
the planet. On the night of August twelfth, he was
using a twenty six inch telescope, which was one of
the largest in the world at the time. After several
nights of careful observation, he finally spotted what appeared to
be a small, faint object near Mars. Initially, Hall was

(00:42):
uncertain whether he had actually discovered a moon or if
it was just a star or some other celestial object. However,
after observing it for several more nights, he confirmed that
the object was indeed orbiting Mars, and that it was
not just one moon but two. Hall named the moon's
Phobos and Demos after the Greek mythological twin characters who

(01:04):
accompanied their father Ares, the god of war, into battle.
The names were fitting because Mars was named after the
Roman god of War, and its two moons appeared to
be his loyal companions. The discovery of Phobos and Demos
was a significant milestone in the field of astronomy and
planetary science. It marked the first time that moons had

(01:26):
been discovered orbiting another planet besides Earth, and it provided
valuable insights into the formation and evolution of the Solar System.
Since their discovery, Phobos and Demos have been the subject
of numerous scientific studies and missions. In nineteen sixty nine,
the Mariner seven spacecraft flew by Mars and captured the
first close up images of the two moons. In twenty

(01:49):
twenty four, just a year before the date mentioned in
the prompt, NASA plans to launch the Martian Moon's Exploration
MMX mission, which will study both Phobos and Demos in detail,
an even attempt to collect samples from Phobos to bring
back to Earth. The discovery of Phobos and Demos on
August twelfth, eighteen seventy seven, by Assaf Hall was a

(02:10):
groundbreaking achievement in the history of astronomy and planetary science.
It opened up a whole new realm of possibilities for
exploring and understanding our Solar system and it continues to
inspire scientists and researchers to this day. And that wraps
it up for another episode. Please subscribe and join us
tomorrow for another great moment in science. This has been

(02:30):
a Quiet Please Studio's production. For more check out Quiet
Please dot Ai. Thank you for listening.