Hey timeline kin, it’s a warm, quiet morning on July 28, 1973, at Kennedy Space Center in Florida. The massive Saturn IB rocket stands ready on the launch pad, carrying the Skylab 3 crew and a very special scientific payload. Tucked inside a small plastic container are two tiny spiders — Arabella and Anita — ordinary cross spiders that had been carefully selected from a classroom experiment back on Earth. As the countdown reaches zero and the rocket lifts off with a thunderous roar, these two small arachnids are about to become some of the first spiders to travel into space. While the astronauts prepare for a long stay aboard America’s first space station, these spiders carry a simple but profound question: can life weave its ancient patterns in the weightless void of orbit?
This is the story of Arabella and Anita — the two spiders that flew aboard Skylab 3 in 1973. Their mission was part of a groundbreaking student experiment, yet it became one of the most memorable biological studies of the early Space Age. In zero gravity, they attempted to spin webs that had been perfected over millions of years on Earth. Their efforts provided unexpected insights into biology, behavior, and the adaptability of life beyond our planet. What began as a simple high school science project turned into a quiet but fascinating chapter in humanity’s exploration of space.
The Origin of the Experiment
The story begins not in a NASA laboratory, but in a high school classroom in Lexington, Massachusetts. In 1972, a student named Judith Miles submitted a proposal to NASA’s Skylab Student Project. She wanted to know how spiders would build webs in the weightless environment of space. NASA accepted her idea as one of the student experiments to fly on Skylab 3. Two common cross spiders (Araneus diadematus) were chosen: Arabella and Anita. They were placed in a specially designed plastic box with a camera to record their web-building attempts.
The goal was simple yet scientifically valuable: to observe whether the absence of gravity would affect the spiders’ ability to construct their characteristic orb webs. On Earth, spiders use gravity as a reference to orient themselves and build symmetrical webs. In space, with no “up” or “down,” would they still be able to spin?
Launch and Life Aboard Skylab (July–September 1973)
Skylab 3 launched successfully on July 28, 1973. The crew — Alan Bean, Owen Garriott, and Jack Lousma — settled into their long-duration mission aboard America’s first space station. Soon after arrival, they opened the spider experiment container. Arabella and Anita were released into their habitat.
At first, the spiders seemed disoriented. Without gravity, they floated and tumbled, struggling to anchor their silk threads. But after a few days of adaptation, they began to spin. The webs they produced were different from those on Earth — less symmetrical, sometimes incomplete, and built with thinner threads. Yet they still managed to create functional webs, showing remarkable adaptability. Arabella eventually built a nearly complete web that was used for several experiments, including testing how the web responded to vibrations in zero gravity.
The astronauts observed and documented the spiders’ behavior with fascination. The experiment showed that spiders could adjust to weightlessness, though their web-building was less efficient. This provided early data on how complex behaviors and instincts might function in space — information that would prove useful for future long-duration missions with living organisms.
The Return to Earth and Scientific Impact
Skylab 3 returned to Earth on September 25, 1973, after 59 days in space. Arabella and Anita were brought back alive, though they did not survive long afterward. Their webs and behavior were studied extensively. The results showed that while spiders could adapt to microgravity, the lack of gravity affected the structure and tension of their webs. This helped scientists understand how gravity influences animal behavior and web construction.
The experiment was a success for the Skylab Student Project, demonstrating that even simple student ideas could contribute meaningful data to space research. It also captured the public’s imagination — two ordinary spiders becoming space travelers captured hearts and sparked interest in biology and space science.
Broader Implications for Space Research
The Arabella and Anita experiment demonstrated that instinctive biological behaviors could adapt to the microgravity environment of space. Although their webs initially appeared irregular and less symmetrical than those constructed on Earth, the spiders gradually adjusted their behavior and produced increasingly functional structures. The experiment provided early evidence that gravity serves as an important environmental cue but is not always essential for completing complex biological tasks.
The mission also highlighted the value of biological studies in human space exploration. Understanding how organisms respond to altered environments became increasingly important as space agencies began considering long-duration missions and orbital habitats. Research involving insects, plants, microorganisms, and animals contributed to a broader understanding of adaptation mechanisms that would later support studies related to human physiology in space.
Beyond its scientific value, the Skylab spider experiment demonstrated that meaningful research questions can emerge from unexpected places. A student proposal evolved into a successful space experiment, illustrating how curiosity-driven science can contribute to larger scientific objectives.
What part of Arabella and Anita’s story stays with you?
The image of two small spiders floating inside their container aboard Skylab?
The moment they began spinning webs in zero gravity?
The quiet contribution of a student experiment to NASA’s early space research?
Or the realization that even the tiniest creatures helped humanity take its first steps toward living in space?
The image of two small spiders floating inside their container aboard Skylab?
The moment they began spinning webs in zero gravity?
The quiet contribution of a student experiment to NASA’s early space research?
Or the realization that even the tiniest creatures helped humanity take its first steps toward living in space?
Write whatever is on your mind below. I read every word.
Books that shaped how I see the Skylab spider experiment:
Books that shaped how I see the Skylab spider experiment:
- Skylab: America’s Space Station by various NASA historical accounts
- Animals in Space by Colin Burgess and Chris Dubbs
- The Skylab Student Project historical records
Reliable sources I leaned on for key facts:
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