In the centre of our galaxy sits a monster 4.3 million times the mass of the sun. But Sagittarius A* is tiny compared with other black holes in the universe, with some reaching up to 40 billion times the mass of the sun. They are the point where our laws of physics break, and how these giants get so big has puzzled scientists for decades.

Becky Smethurst is an astrophysicst at the University of Oxford and her work looks at how these behemoths affect the galaxy around them. Â鶹´«Ã½‘s digital features editor, Jacklin Kwan, sat down with her to discuss what black holes are, how the supermassive ones get so big and Smethurst’s amazing career.

Dinosaurs are the biggest creatures to have ever walked on land, dominating Earth for over 130 million years. But how could such extraordinary creatures have simply vanished in the blink of a geological eye? For decades, we’ve assumed these prehistoric megafauna – a staple of our childhoods and Hollywood movies – went extinct for one simple reason: the asteroid that hit Earth was so unimaginably large that it changed everything in one single blow. But now, thanks to new research, an even more intriguing idea has emerged: size alone doesn’t explain what happened.

The real reason the impact was so devastating may have been its angle. Had the asteroid arrived a little steeper, the outcome might have been different. A little shallower, different again. And for life on Earth at the time, predominantly dinosaurs on land, marine creatures in the sea and pterosaurs in the air, it appears to have struck at almost the worst possible angle imaginable, launching vast quantities of rock, dust and climate-altering gases high into the atmosphere and triggering one of the greatest mass extinctions in Earth’s history.

Quantum mechanics and general relativity don’t fit together, and a big part of the issue comes down to gravity. For decades, the accepted route to an ultimate theory of everything has involved taking our best theory of gravity and squeezing it into the frame of quantum mechanics. Yet, almost a century later, scientists still haven’t managed to make gravity fit. Ivette Fuentes is a professor of quantum mechanics who conducts experiments at the scales where quantum theory and general relativity interplay. Fuentes sat down with Â鶹´«Ã½ features editor Thomas Lewton to discuss the issues and fascinating theories that pop out when we try to fit classical and quantum mechanics together.

Read more: The experiments that could finally explain gravity

Homo sapiens have been around for about 300,000 years. Often, our big brains and intelligence are credited with making us the most successful species to have ever walked on Earth, but that isn’t entirely true. There was another species of human that survived on this very same planet for nearly 2 million years, which was the grandparent of so many other human species, including us. They explored new continents. They mastered tools. They may have controlled fire. And they did it all with a brain barely half the size of ours. Enter Homo erectus, a species that may force us to confront an uncomfortable possibility… that intelligence alone isn’t what makes a species successful.

Read more: How Homo naledi is changing what we know about death

What really happens in the quantum world? In this conversation, physicist Sean Carroll explores some of the deepest mysteries in quantum mechanics: the famous double-slit experiment, wave function collapse, the Many Worlds interpretation, entropy and the arrow of time. Speaking to Â鶹´«Ã½ reporter Jacklin Kwan, Carroll discusses why electrons appear to behave like waves, how observation seems to affect reality and whether the universe constantly branches into countless parallel worlds. Carroll also explains the measurement problem, the challenges of interpreting quantum theory and why physicists still debate what quantum mechanics is actually telling us about the nature of reality. Carroll is a theoretical physicist, cosmologist and author whose work focuses on the foundations of physics, quantum mechanics, cosmology and the nature of time.

Read more: Why quantum physics says there’s a multiverse

Everything around us – from our bodies to the stars – is made of matter. But according to our best theories, none of it should exist. The big bang should have created equal amounts of matter and antimatter, and that should have caused the newborn universe to annihilate itself instantly. So why are we here?

In this video, we go behind the scenes at CERN, the world’s largest particle physics laboratory, to explore how scientists create, trap, transport and study antimatter at the appropriately named Antimatter Factory. Is there a tiny, fundamental difference between matter and antimatter? The answer could explain one of the oldest questions in science: Why is there something instead of nothing?

Read more: CERN upgrade: Inside the world’s largest scientific experiment

Physically, Homo sapiens isn’t that special in the animal world. But our species has discovered ways of beating the odds of survival in every habitat, from jungle to Arctic wasteland. In our latest interview with biological anthropologist and broadcaster Alice Roberts, we discuss the wonderful benefits bestowed on us by animals from our evolutionary past. The biochemistry in our cells goes back to the earliest single-celled creatures living in the ancient oceans, and our arms and legs date back to when the first amphibians crawled onto land around 360 million years ago.

Read more: These are the extinct humans that live on in your DNA

Antarctica is melting and one of its largest glaciers is collapsing from underneath. This is Thwaites glacier, sometimes called the doomsday glacier – and for good reason. If it destabilises, it could trigger a wider collapse of the West Antarctic ice sheet, raising sea levels by up to 5 metres. Scientists believe we may be approaching a tipping point that could completely redraw the world’s coastlines, putting cities such as Kolkata, New York and London at risk of severe flooding, displacing millions of people.

In our latest video, we speak directly to scientists involved in an international effort to better understand what is happening with Thwaites, what the risks involved are and why it’s potentially much more devastating than we previously thought.

Read more: The ‘doomsday’ glacier’s giant ice shelf is about to break away

On Q-Day, your privacy will be at stake. This is the moment when quantum computers break the encryption protecting the modern world, bank transactions become readable, private messages get exposed and even state secrets become vulnerable.

For years it sounded like sci-fi, something that was decades away from happening, if it happened at all. But now, research suggests that we may be hurtling towards Q-Day at a rapid speed.

In this video, Â鶹´«Ã½ uncovers why many experts think the countdown to Q-Day may already have begun, and explains how quantum computers work and why these machines could both threaten the security of the modern world and unlock breakthroughs that could change our lives. Special thanks to Quantum Motion for letting us film at its facilities.

The Â鶹´«Ã½ Book Club has been reading Luminous, Silvia Park’s near-future story set in a reunified Korea in which robots are fully integrated into society. Head of books Alison Flood caught up with Silvia to talk about how this increasingly dark story began as an idea for a children’s book, whether the advent of large language models affected their writing, and whether robots might one day achieve consciousness.

Read more: Why I explore our inevitable love for robots in my novel Luminous