Robert Lea

Robert is a member of the Association of British Science Writers and the Institute of Physics, qualified in Physics, Mathematics and Contemporary science. He contributes articles on topics as diverse as quantum physics, cosmology, medical science and the environment at Scisco media.
Opinion Science & Technology

Escaping the Grandfather Paradox

Time-travel has long been a staple of genre films, novels and television shows, with many of these tales focusing on the consequences of travelling back in time and threatening one’s own existence. The ‘grandfather paradox’ is not simply a facet of pulp fiction though, it consequences of the violation of causality have been hotly debated philosophers and physicists alike. Could the many-worlds interpretation of quantum mechanics rescue a hapless (and clumsy) time-traveller.

Science & Technology

Hawking radiation. How black holes evaporate.

One of the great ironies of Hawking’s death was that fact that one of his most revolutionary contributions to science suggested that nothing in our universe can last forever. In the formulation of Hawking radiation, he showed us the even, cosmological giants, black-holes, may eventually ebb away. In considering Hawking’s genius we will be exposed to a greater, far crueller irony, the reason that one of the greatest minds in this era of science will never hold its greatest accolade.

Environment Science & Technology

The hidden dangers of climate change: Huge reserves of mercury found in arctic permafrost

One of the most pressing but often over-looked concerns with increasing global temperatures are the dangers gradually revealing themselves to scientists from unexpected, previously unconsidered sources. Scientists have discovered that permafrosts hide a potentially deadly threat to ecosystems, massive reserves of mercury hidden in permafrost in the Northern Hemisphere.

Health Science & Technology

Artificially grown human eggs- a major step towards combating infertility

In what represents a major breakthrough in infertility treatment, reproductive biologist Evelyn Telfer and colleagues at the University of Edinburgh have finally completed the development of a human egg outside the human body for the first time, it was announced in January. The development represents the first step it what may be a major victory for both infertile couples and women who have suffered illnesses such as cancer in prepubescence, looking to have children. 

Chris Packham, associate professor of physics and astronomy at The University of Texas at San Antonio (UTSA), has collaborated on a new study that expands the scientific community's understanding of black holes in our galaxy and the magnetic fields that surround them. "Dr. Packham's collaborative work on this study is a great example of the innovative research happening now in physics at UTSA. I'm excited to see what new research will result from these findings," said George Perry, dean of the UTSA College of Sciences and Semmes Foundation Distinguished University Chair in Neurobiology. Packham and astronomers lead from the University of Florida observed the magnetic field of a black hole within our own galaxy from multiple wavelengths for the first time. The results, which were a collective effort among several researchers, are deeply enlightening about some of the most mysterious objects in space. A black hole is a place in space where gravity pulls so strongly that even light cannot escape its grasp. Black holes usually form when a massive star explodes and the remnant core collapses under the force of intense gravity. As an example, if a star around 3 times more massive than our own Sun became a black hole, it would be roughly the size of San Antonio. The black hole Packham and his collaborators featured in their study, which was recently published in Science, contains about 10 times the mass of our own sun and is known as V404 Cygni. "The Earth, like many planets and stars, has a magnetic field that sprouts out of the North Pole, circles the planet and goes back into the South Pole. It exists because the Earth has a hot, liquid iron rich core," said Packham. "That flow creates electric currents that create a magnetic field. A black hole has a magnetic field as it was created from the remnant of a star after the explosion." As matter is broken down around a black hole, jets of electrons are launched by the magnetic field from either pole of the black hole at almost the speed of light. Astronomers have long been flummoxed by these jets. These new and unique observations of the jets and estimates of magnetic field of V404 Cygni involved studying the body at several different wavelengths. These tests allowed the group to gain a much clearer understanding of the strength of its magnetic field. They discovered that magnetic fields are much weaker than previously understood, a puzzling finding that calls into question previous models of black hole components. The research shows a deep need for continued studies on some of the most mysterious entities in space. "We need to understand black holes in general," Packham said. "If we go back to the very earliest point in our universe, just after the big bang, there seems to have always been a strong correlation between black holes and galaxies. It seems that the birth and evolution of black holes and galaxies, our cosmic island, are intimately linked. Our results are surprising and one that we're still trying to puzzle out." Read more at:
Science & Technology

New research sheds light on the properties of black holes

Without a doubt, black holes are the most mysterious objects ever discovered by astronomers mostly due to the fact that unlike other astronomical bodies, black holes cannot be observed directly, their mass is so great and contained within such a small radius that even light cannot travel fast enough to escape their gravity. Cosmologists and astronomers have found ways around this problem, including the observation of matter falling into black holes. It is this method that has allowed researchers at several institutions across the US to learn more about the composition of black holes and to discover that their properties may well defy previous expectations.