The universe is expanding faster than expected, but we don't know what's driving it. Here are a few of the possible explanations, from dark energy to a modification of general relativity.
Something mysterious is pulling our Milky Way through space at a much faster rate than expected. So what could it be?
There's a good reason you should care about the discovery of gravitational waves, even if you don't understand the science.
The discovery of gravitational waves involved a team of more than 1,000 scientists from across the globe, including Australia. So how does such an international collaboration work?
It's taken centuries for our understanding of gravity to evolve to where it is today, culminating in the discovery of gravitational waves, as predicted by Albert Einstein a century ago.
Here's a LIGO insider's description of how he got the news of a phenomenon that had first been theorized 100 years ago.
If you understand how a trampoline works, you'll be able to understand what gravitational waves are.
A glimpse inside a truly extraordinary experiment.
2015 was a year where we expanded our view of the universe, embraced new technologies and got a hint of the profound changes to come.
Four decades later, I find myself surveying 13 billion years of cosmic history and mapping events that really did happen a long time ago in galaxies far, far away.
After the triumph of general relativity, Albert Einstein spent the rest of his life chasing a unified theory, which eluded him right up until the end.
Many people think relativity puts a hard speed limit on the universe, but it actually opens up the possibility of faster-than-light travel - if we can overcome some significant practical hurdles.
Einstein's theory of general relativity is a triumph of reason and imagination, of art and science, with a profound beauty of its own.
Physicists are working hard to unite Einstein's theory of relativity with quantum mechanics. It's no easy task.
Space, time and space-time: it's all relative.
General relativity challenges our intuitive conception of how space and time work, which might explain why it's such a popular target for crank theorists.
Special relativity was inspired, but it took true genius to conceive of general relativity. Had Einstein not come up with it, it may have taken decades for us to figure it out.
We talk about mass all the time but what is it that actually gives an object mass? And why do some things have mass and others have no mass at all?
This month is the centenary of the general theory of relativity. But how did we get from the absolutism of Newton to the relativity of Einstein?
A new detector built deep underground in a gold mine will hopefully unravel the mystery of dark matter.