Bob McDonald’s Top 10 Science Stories of 2025

As technological advances become more sophisticated, so do the opportunities to delve deeper into scientific mysteries in space and here on Earth. Here is my list, in no particular order, of the top 10 inventions, natural phenomena, and notable events of 2025.

Vera C. Rubin Telescope’s ‘First Light’ Images

Vera C. Rubin Observatory, Based in Chile, released its first images this year. It is not the world’s largest telescope with an 8.4 meter wide main mirror, but it has the world’s largest digital camera with 3.2 gigapixels. The observatory is able to take high-resolution images of the entire southern sky and will repeat this every night for 10 years. These stunning images of the sky will be assembled to provide a time-lapse movie of the universe, revealing everything going on from nearby asteroids, the planets in our solar system, to colliding galaxies, the expansion of the universe and the presence of mysterious dark matter.

asteroid bennu samples

In September 2023, a small capsule landed on Earth containing samples of an asteroid that were collected by the OSIRIS-REx spacecraft. Now, Scientists have published the results Their analysis of the dark granular material revealed that they contained sugars, amino acids, nucleobases, and carboxylic acids. These elements are essential for life on Earth, forming the basis of DNA and RNA. This doesn’t mean the asteroid contains life, but it does raise the possibility that the molecular elements of life were common in the early Solar System and could have been brought to the early Earth from space.

Canada’s first astronaut Marc Garneau passes away

The first Canadian in space, Marc Garneau, He died on June 4, 2025, at the age of 76. A former naval commander, he was among six Canadian astronauts selected to become our country’s first astronauts in 1983. In 1984, he was aboard the Space Shuttle Challenger, the first of three space flights he would make during his career as an astronaut. He was Chairman of the Canadian Space Agency from 2001–2005, then turned to politics where he became Minister of Transportation and Minister of Foreign Affairs. He retired from political life in 2023. You can read more about his remarkable career in his memoir, Marc Garneau, a most extraordinary ride.

Read more: Canada’s first man in space, Marc Garneau – and a privileged journalist who knew him

Comet 3i/Atlas

The fastest comet ever seen is hurtling through our solar system at an astonishing speed of 209,000 km/h, Comet 3i/Atlas Obviously it is not from here, nor is it an alien spacecraft. When it was first observed by a telescope in Chile on July 1, 2025, its extraordinary speed – well above our Sun’s escape velocity – revealed that it came from another star system after traveling through interstellar space for billions of years. Once it passes through our solar system, it will never return as it continues its journey through our galaxy. Like most comets, it is composed of ice and dust and has been studied by various telescopes on Earth and in space, providing a glimpse of the structure of another star system.

Read more: Here’s what astronomers know so far about the third interstellar visitor ever found

Ocean acidification beyond the tipping point

Ocean acidification is caused by absorbing excess carbon dioxide from the atmosphere, reached its peak this yearThreatened coral reefs around the world. CO2 dissolves in seawater and forms an acid that destroys coral reefs, as well as the shells of marine life such as crabs and mussels. Acidification, along with record increases in ocean temperatures, could lead to the collapse of ice sheets and the destruction of rainforests. Tipping point is similar to the point of no return, where a system changes from one state to another. Historically, Earth has gone through several inflection points where it changed from warm to cold ice ages and back again. The difference this time is that we humans have greatly increased the CO2 in our atmosphere by burning fossil fuels, speeding up the process. during this timeUN COP30 meeting fails in Brazil To prepare a roadmap to phase out fossil fuels.

Read more: Oceans becoming dangerously acidic due to carbon emissions, report warns

Geoengineering was considered impractical

Geoengineering- This has long been a taboo subject among climate scientists, who argue that we need to focus on reducing our carbon emissions rather than focusing on risky Band-Aid geoengineering solutions. In a comprehensive report StudyPolar scientists condemned a number of ideas, such as injecting aerosols into the stratosphere to reduce incoming sunlight or artificially thickening sea ice for use in the Arctic and Antarctica to counter the effects of global warming, as “dangerous”.

First human mission to the poles: Fram2

For the first time, humans entered a polar orbit around the Earth. Throughout the history of space flight, all missions have flown around Earth’s equatorial and mid-latitudes or gone to the Moon. this years, FRAM2 privately funded missionUsed the SpaceX Dragon capsule to orbit the Earth in a north-south direction, passing directly over the North and South Poles During the three and a half day flight. The four-man team was able to directly observe the Arctic Ocean and Antarctic ice sheet and gain a space perspective on the areas they discovered on the ground.

The James Webb Space Telescope continues to surprise

After working for three years in deep space, 1.5 million kilometers from Earth, James Webb Space Telescope Important discoveries continue to be made about the atmospheres of planets orbiting other stars, black hole mergers, activity at the center of our galaxy, and the oldest galaxies ever observed, which formed shortly after the Big Bang. As the largest telescope ever launched into space, it is used by thousands of scientists around the world who take advantage of its clear view of the universe.

Stranded astronauts return home

after Stranded on the International Space Station for nine months, American astronauts Sunny Williams and Butch Wilmore finally touch down off the coast of Florida. The pair began their journey with a week-long test flight of the Boeing Starliner spacecraft in June 2024, but the capsule developed thruster problems and helium leaks while in space. NASA deemed the capsule unsafe for the crew and returned it empty. Even though it landed safely, the pair had to wait until a private SpaceX Dragon capsule was sent to rescue them in March 2025.

International Year of Quantum Science and Technology

UNESCO declared as of 2025 International Year of Quantum Science and Technology In a worldwide initiative aimed at raising public awareness of new developments in quantum computing. This emerging technology uses quantum effects to analyze big data faster and more efficiently than traditional, silicon-based systems. In the United States, IBM has set up a quantum computer to look at drug discovery through simulations of the behavior of molecules. While the technology is still being developed, it is anticipated that it will improve weather forecasting and other tasks that require large data sets.