There are two broad ways to measure the expansion of the universe. One is based on the cosmic microwave background, shown here, along with our own galaxy viewed in microwave wavelengths.
ESA, HFI & LFI consortia (2010)
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.
An artist’s impression of the galaxies found in the ‘Zone of Avoidance’ behind our Milky Way.
International Centre for Radio Astronomy Research
Something mysterious is pulling our Milky Way through space at a much faster rate than expected. So what could it be?
CSIRO’s Compact Array telescope under the Milky Way.
Astronomers think they may have found evidence within our galaxy of some of the missing matter thought to make up our universe.
Our tendency to see what we want to see is the biggest threat to cosmology.
Confirmation bias, the psychological effect that makes people unconsciously interpret information to confirm their beliefs, is a big threat to cosmology.
The ALICE detector at the Large Hadron Collider may help unravel some of nature’s grestest mysteries.
Our panel of experts speculate on which of science's biggest questions could be answered in the coming months.
Humans have now been living on the International Space Station for 15 years. Here's what we've learned.
Astronomers believe that the dark blue ring in this image must be mysterious dark matter.
While we know that dark matter exists, we have no idea what it is. Luckily, there is no shortage of suggestions.
A cosmological event could have unleased the huge comet or asteroid that led to the demise of the dinosaurs.
James Sinclair from the University of Sussex entering the SNO detector for upgrade work to transform this experiment into SNO+.
The SNO+ collaboration
The tiniest of particles could have huge potential to solve the greatest mysteries of the universe - including why there is more matter than antimatter.
Dark matter is notoriously hard to detect, but a new experiment might finally shed light on this mysterious substance.
A new detector built deep underground in a gold mine will hopefully unravel the mystery of dark matter.
Understanding how galaxies are arranged could be the key to figuring what causes the expansion of the universe.
ESA/Hubble, NASA and S. Smartt (Queen's University Belfast)
A unique map of the galaxies in the sky could shed light on the mysteries of the universe – including dark energy and dark matter.
Running the world's largest particle accelerator requires a lot of energy, but it could reveal the secrets of the universe.
Dark Matter: as simulated, the scaffold that underpins the universe.
Dark matter's mysteries are being steadily unravelled by new studies of remote galaxies.
Looking for dark matter in the galaxy collisions such as in Abell 2744, dubbed Pandora’s Cluster.
X-ray: NASA/CXC/ITA/INAF/J.Merten et al, Lensing: NASA/STScI; NAOJ/Subaru; ESO/VLT, Optical: NASA/STScI/R.Dupke
Scientists know so much about dark matter apart from what it is exactly. But are they getting any closer?
Are you afraid of the dark matter?
European Southern Observatory
Every 30 mil years, Earth has to deal with more comet crashes from space and more intense geological activity from within. Dark matter may be the culprit in these episodes that can cause mass extinction.
Artist’s impression of the Square Kilometre Array at night.
Telescopes have come a long way since the days when they were all about lone astronomers watching the night sky through their upstairs windows. Today teams of astrophysicists build and use much more modern…
This artist’s impression of the Milky Way galaxy. The blue halo of material surrounding the galaxy indicates the expected distribution of the mysterious dark matter.
While invisible, dark matter completely dominates our Milky Way, recent measurements of just how much dark matter there is have revealed a bit of a mystery. In a paper published today in the Astrophysical…
Scary but fascinating.
NASA and M. Weiss (Chandra X -ray Center)
Katherine Mack, astrophysicist at the University of Melbourne, answered questions posed by the public on Reddit. The Conversation has curated the highlights. Dark Matter How do you explain dark matter…
Virgo consortium: the web that holds the galaxies together.
According to cosmologists, galaxies are joined together by filaments, quite literally. These filaments form the cosmic web and are made of mostly dark matter, many stars and some gas. Observing these filaments…
Dark matter is still a bit of mystery.
A US team with a highly sensitive dark matter detector has just finished its first run. It has found nothing, and that is still big news. Physicists can explain accurately the behaviour of what makes matter…