The strong Indian presence at Sweden’s Children’s Climate Prize

says Arushi, in an interview with Global Indian. Academically, she had long since surpassed her school work, and wanted to spend her time taking deep dives into the subjects she loved most – math, coding and astronomy. Her parents – her father is an environmentalist and her mother a writer – supported their daughter fully and when Arushi was six, her dad drove her to her first ever hackathon.

[caption id="attachment_34734" align="aligncenter" width="485"] Arushi Nath, winner of the Best Project award at the Canada-Wide Science Fair 2023[/caption]

The hackathon veteran

This was 2014 and Arushi was the youngest competitor there, by far. NASA's Curiosity rover had just landed on Mars and Arushi was "so fascinated by the idea of being able to land and control something on a whole other planet," she smiles. So, at the hackathon, she and her team made a little robot that could identify obstacles and avoid them. Very complex work for a six-year-old - "We created the physical structure, then coded it," Arushi explains. The robot's ultrasonic sensor could detect obstacles and avoid them. And all this was possible because Arushi had already familiarised herself with Arduino - an open-source electronic prototyping platform that allows users to create interactive electronic objects.

As far as Arushi was concerned, doing projects was the best way to learn. She also wanted to bring her scientific acumen together with the things she cared about. So, in 2018, when she and her friends attended the School Strike for Climate started by Swedish Climate activist Greta Thunberg, Arushi wanted to do more “than raise slogans or wait for others to act,” she said.

S.N.A.C.K.

This led to her designing ‘Schools and NASA Aiding Climate Action by Kids’, which  comes with the catchy abbreviation, ‘S.N.A.C.K.’. The project uses satellite imagery to calculate tree densities of schools in Toronto, than ranks and maps them. She also designed a pollution sensor to measure levels in parks and schools across the city, using Arduino, the open source electronics platform that lets users create interactive models. “I wanted school children to come up with local solutions to global challenges,” she says.

Her efforts resulted in her being named the NASA SpaceApps Global Nominee – she had already won the Space Apps Challenge in 2014 and again in 2018. In fact, by the age of 10, she had been at a jaw-dropping 29 hackathons. This was a special win, though, she says, of S.N.A.C.K, as it was her first solo attempt. ” I had to do all the work myself, from thinking of the idea, making it, coding and presenting it to the judges in 40 hours.”

The dragonfly drone

As far as Arushi was concerned, doing projects was the best way to learn. During the Covid-19, she began work on her first major endeavour – building a drone – quite a feat for the young scientist, who was only 10 years old at the time. The idea for the directional dragonfly drone was born during the COVID-19 lockdown. Disturbed by the news of locusts devastating crops in Asia and Africa, Arushi saw an opportunity to make a difference. "These locusts often travel in large swarms, are very fast, and can change direction unpredictably," the Global Indian explained, underlining the urgency of the problem.

Arushi's solution was to use drones for locust control, "as they can fly, follow the locusts, and monitor their behavior," she explains. She also wanted to biomimic nature, choosing the dragonfly because it is by far the most efficient hunter, with a 95 percent success rate in catching prey (in comparison, the success rate of lions is 25 percent and sharks have a 50 percent chance of success). "I made a protoype using a soda can, a motor and a distance sensor I created on Arduino," Arushi says. When she returned from the Ellehacks hackathon, she refined her model, using lego pieces to create a drone "I programmed it to identify all red objects as locusts," she said, describing the functionality of her creation.

The planetary defense system

Given her involvement with the Royal Astronomical Society of Canada, her prowess with Python and her love for Maths, Arushi was casting around for a way to bring all her passions together. That's how she the idea for planetary defense against unknown asteroids was born. She had learned about robotic telescopes through the RASC and utilised images from these devices – “I took images from robotic telescopes in Canada, Spain, the US, and Australia to get full sky coverage," Arushi explains. She had to sift through these to pinpoint the unknown asteroids, using the Gaia Star Catalogue for information on star positions, and the NASA Horizon dataset, for predictions on the locations of known asteroids. Then, using her coding and math skills, she developed an algorithm to filter out known entities - “I created custom masks to remove all these objects, leaving me with the unknown objects," she explains.

She couldn’t always go it alone, though, often turning to online forums for help. "When I got some errors, I would try for days, even weeks, on my own to find the answer, but if not, I would reach out to specific forums," she says. She also reached out to experts, including Christina Thomas, the lead investigator on NASA’s DART mission. “"I sent her a message, told her about my current project, and asked if I could have a Zoom meeting to talk to her about her project and how it could relate to mine," Arushi smiles. Thomas responded and the two did get on that Zoom meeting. "I actually asked her for pointers on my project and what I could do," she adds.

Finding acclaim

[caption id="attachment_34735" align="aligncenter" width="594"] Arushi receiving her award at the Canada-Wide Science Fair 2023[/caption]

“The whole thing took about ten months to complete,” Arushi says, Her goals changed along the way, so much so that her first goal and the end result were very different.” Finally, her findings were sent to the Minor Planet Center database. Then came waiting for a response. “A couple of weeks later, I got an email and three of the asteroids had my name next to them,” Arushi smiles. She submitted her project to the Toronto Science Fair and won gold, qualifying for the prestigious Canada-Wide Science Fair, where she also went on to win. “I was watching the results with my family and wasn’t expecting my name to pop up again but it did,” she says.

Now, Arushi is continuing work on her planetary defense project. Now that the DART Mission has successfully entered the Didymos (asteroid) system, she wants to measure the changes of the system during this impact. "I began studying the Didymos binary system for a copule of months before the DART impact," she says, "To fully understand how it has been affected."

• Follow Arushi Nath on LinkedIn