Author Archives: Joseph Burant

Going Extinct: What Really Killed The Dinosaurs?

D. Krentzel (2011), A Triassic archosaur. Flickr – CreativeCommons.

Let me set the scene. It’s a sunny day in Laurentia, present day North America, circa 65 million years ago (Ma). A gigantic yet graceful Triceratops casually munches away on a fern frond, unaware that life on Earth will soon be very different. Thousands of kilometers away, an asteroid 10 km in diameter impacts at the Yucatan peninsula in the Gulf of Mexico with over 100 million megatons of force, setting into action a dramatic series of events that will see the sun set on the reign of the dinosaurs.

NASA (2011), The Chicxulub Impact. Wikimedia Commons.

At least that’s the story we are probably all familiar with. Indeed, that is the generally accepted theory for the cause of the mass extinction that marked the boundary of the Cretaceous and Paleogene periods (K-Pg; previously known as the K-T boundary) and resulted in the extinction of some 75% of all species on the planet. However, the details of where the asteroid came from and what caused it to come barreling to Earth are still being debated. As a recent article in Nature reports, the answers might be found in the periodicity of our movement through space. Allow me to explain.

Just as the planets orbit the Sun, our Solar System is moving through one of the arms of our galaxy, the Milky Way. However, the movement of our Solar System through the galaxy is not as simple as you might think. Not only are we hurdling through space at 70,000 km/hr, but the Solar System is also oscillating vertically through the galactic plane – a densely packed disk that slices through the centre of the galaxy. In the latest paper on the subject, soon to be published in Physical Review Letters, Lisa Randall and Matthew Reece (2014) propose that this disk may be composed of dark matter and that our Solar System moves through the plane at regular 35 million-year intervals.

Movement through this dense layer of dark matter is thought to cause gravitational distortion in the Oort Cloud, which is a hypothesized sphere of millions of asteroids that lies about one light-year away and surrounds our entire Solar System. Specifically, it has been hypothesized that in the centre of the galactic plane gravitational pull from the dark matter ‘stretches’ the Oort Cloud and weakens the effects of the Sun’s gravity. As the Sun exits the plane, the cloud rebounds and, similar to an elastic band shooting a wad of paper, asteroids may be sent flying into the inner Solar System.

So, is this elusive dark matter really to blame for the dinosaur’s demise? Maybe, but as astrophysicist Adrian Merlott points out, “dark matter is a possible explanation, but it’s not clear that it’s explaining anything real.” While the Chicxulub Impact Event is believed to be proximately responsible for the mass extinction 65 Ma, scientists are still searching for an ultimate, astronomical cause.

D. Young (2011), Milky Way Galaxy. Flickr – CreativeCommons.

– Joseph Burant

Are Europe and North America Losing the Battle for Science Supremacy?

Research. Image Credit: MedCityNews

For centuries, Western Europe and North America have resided at the centre of innovation, research, and scientific advancement. Starting with the Scientific Revolution, which saw the advancement of modern science, the major European countries began to assert their prowess in the intellectual arena. Jumping ahead, up through the age of Imperialism and into the Industrial Revolution of the mid-18th and 19th centuries, the United Kingdom emerged as the clear leader in scholarship and technological innovation. Beginning in the 19th century, the United states moves to the forefront of global scientific efforts; a place it arguably holds even today. Despite the storied history of western dominance of science in the modern age, recent research suggests a swing in the balance of power may be under way.

 Several recent articles in Nature News & Comment have reported that, over the last decade, China has slowly maneuvered its way to the top.  Specifically, China is now the world’s third-largest producer of scientific research articles and has nearly tripled the percentage of its gross domestic product (GDP) it invests in science and innovation. Even as the combined productivity of the European Union and US has declined, China’s own output has climbed from 3% to 11% since 2001. Furthermore, at 1.98% GDP investment in research and development in 2012, China has officially surpassed Europe and now places third, behind the US and Japan. Interestingly, while European investments remain relatively stagnant, China is set to increase to 2.5% GDP investment in R&D by 2020. No matter how one looks at it, China, and many other parts of Asia, are rapidly becoming global competitors in the race for science supremacy.

Perhaps more worrying that China’s rise in the ranks of international funding and scientific innovation and publishing, is the widespread decline of education is mathematics and science in western countries. The Paris-based Organisation for Economic Co-operation and Development (OECD), an association of 34 member countries aimed at aligning domestic and international policies, administers a test to assess the success of each countries teaching in mathematics, reading, and science. The Programme for International Student Assessment (PISA) is administered to 15-year-old students every three years, and is meant as a comprehensive performance review of education policies. Once the dominant contestants for the top 10 overall educational results, the 2012 PISA results show that western countries have rapidly fallen behind Asian constituents, with the US scoring below the OECD average in all three categories of interest.

Programme for International Student Assessment (PISA) Ranks. OECD 2012.

So has the time of western-led scientific advancement come to an end? Probably not. Although the current numbers show that the the EU and North America are lagging, the US has retained its position as the number one country for research and development and foreign direct investment. Furthermore, while China’s %GDP investment in research and innovation has surpassed that of the European Union, the total dollar-amount investment made by the EU still remains higher. Additionally, the same article discussing China’s recent growth in research out-put also noted that the US remains the leading producer of highly cited literature, whereas Chinese-published material is largely cited within China alone, and argues that this may be a case of quantity over quality. Lastly, international research collaboration and ‘big science’ is at an all time high, suggesting that while each country is  facing its own challenges, collaboration may allow for sharing of the burden.

– Joseph Burant