Don Pettit, NASA’s oldest active astronaut, made his return to Earth on April 20th, coinciding with his 70th birthday. This marked the end of his fourth mission, a demanding 220-day stay at the International Space Station.
Throughout his time aboard the space station, Pettit engaged in various experiments, interacted with students, and exercised extensively to maintain his health and combat bone density loss. However, his most captivating contribution was through his photography.
For many on Earth, going to space is simply a dream. “I caught a glimpse of how they perceive my image,” said Pettit during a press conference following his return to Japan.
Pettit mentioned that dedicated photographers always carry a camera. “I could gaze out of the window and enjoy the stunning views,” he described. “But every time I look out, I am just enjoying it, saying to myself, ‘Wow, look at that. Oh, there’s a flash. What’s happening there?’ and, ‘Ah, a volcano appears.’ Then I think, ‘Where’s my camera?’
At times, he would set up five different cameras simultaneously in the cupola module, where seven windows offered sweeping vistas of space and Earth.
Capturing images in space shares similarities with night photography; the stars are faint and require longer exposure times to gather sufficient light. However, in orbit, everything is in constant motion, with the space station racing at 5 miles per second while the Earth spins beneath.
At times, Pettit embraced the dynamic beauty. The shimmering lines blurred under the light showcased the stars tracing arcs across the night sky.
“These meld science with art,” Pettit noted on X. “There are so many techniques to observe, or you can simply sit back and think, ‘How cool!’
His camera was fitted with a “trajectory fitting tracker,” a homemade device that gradually adjusts for the space station’s movements, keeping the lens focused on a particular point in the sky.
Thanks to this tracker, he was able to capture a 10-second exposure of the Milky Way shining above the cloudy Pacific Ocean just before dawn, revealing a captivating blue-purple glow from sunlight scattering through nitrogen in Earth’s atmosphere.
The sidereal tracker also contributed to capturing the image below from the windows of the docked SpaceX Crew Dragon spacecraft.
The photo reveals the large and small Magellanic Clouds, the closest galaxies to our Milky Way on a cosmic scale.
In April, Pettit filmed the mesmerizing rhythmic pulsations of the aurora, a glowing phenomenon caused by high-energy solar particles interacting with atmospheric molecules.
On occasion, vibrant lights were the result of human activity, not celestial events. The green lines seen in this photo are similar in color to the aurora but actually result from fishing boats off Thailand attracting squid.
While photographing Earth, Pettit recorded lightning striking in the upper atmosphere above the Amazon Basin in South America. These videos captured time intervals ranging from 6 to 33 seconds, showcasing more intricate details of the flashes.
The Betoshiboca River in Madagascar reminded Pettit of the visual patterns seen in human eyes’ blood vessels.
Similar to wildfires, urban areas intensify in brightness at night.
Pettit seized the opportunity to document spacecraft launching and returning to Earth, including a test flight of a SpaceX Starship rocket from Texas last November…
…and the docking of the SpaceX Dragon spacecraft, scheduled to transport cargo to the space station in December.
During his mission, Pettit also designed an entertaining science experiment. One showcased electrically charged water droplets dancing around a Teflon knitting needle. “I aim to do in space what can only be done in space,” he stated. “I’m worried that when I return, I’ll have to catch up on all the TV shows.”
In another experiment, he injected food coloring into a droplet of water, producing a sphere resembling Jupiter or a pristine marble.
Pettit also dissolved antacid tablets in water. In a microgravity environment, the escaping bubbles create entirely different patterns of pop, fizz, and hiss compared to on Earth.
He even froze thin water ice wafers at minus 140 degrees Fahrenheit. “What can you do with a freezer in space?” He wrote on X. “I decided to grow a thin layer of water ice just for the fun of it.”
Photographing the ice layer through a polarizing filter revealed intricate crystal formations.
While Pettit holds the title of the oldest NASA astronaut, he is not the oldest person to orbit Earth; that honor goes to John Glenn, who flew around the Earth in 1962 and again in 1998 at the age of 77.
Pettit is also not the oldest individual to spend time aboard the International Space Station; that distinction belongs to private astronaut Larry Connor, who was 72 during his two-week mission in 2022, organized by Axiom Space in Houston.
“I’m only 70, with a few good years ahead of me,” Pettit remarked during a news conference. “We’ve managed to squeeze in another flight before we had to finalize the rocket nozzle.”
Source: www.nytimes.com
