What is Dark Matter ?

This force is so huge that it physically bends the light around galaxies, distorting their appearance.

Dark matter binds galaxies together
So dark matter can’t be seen, but it can be felt because of its powerful impact on space.

5. Scientists have created dark matter ‘maps’

Scientists have been able to piece together maps of space, indicating where they think dark matter is hiding.

Dark matter exerts ‘gravitational force’, meaning that it draws other matter towards it. And there’s so much dark matter that its gravitational force is enough to hold entire galaxies – like our own Milky Way – together. That’s why dark matter is often likened to a giant spider’s web, meshing galaxies in place.

By studying ‘relic radiation’ left over from the Big Bang, scientists can identify areas in space where more radiation exists – and more radiation means more matter.

It distorts the appearance of space
We can also see the effects of dark matter simply by looking up at the sky. When astronomers observe distant galaxies, they often appear stretched and oddly shaped.

In this way, we can identify ‘hotspots’, where higher levels of dark matter may be concentrated.

This effect is known as ‘gravitational lensing, and it’s caused by dark matter’s gravitational force. This force is so huge that it physically bends the light around galaxies, distorting their appearance.

6. We don’t know what dark matter is made of
We already know about photons, electrons, quarks and many other particles, but there may be plenty of others waiting to be discovered. One or more of these unidentified particles could be responsible for effects – like gravitational lensing and the ‘spider’s web’ – that we associate with dark matter.

Scientists have created dark matter ‘maps’
Scientists have been able to piece together maps of space, indicating where they think dark matter is hiding.

7. Dark matter might not even exist
Dark matter might be an undiscovered particle, or it might be nothing at all. Some scientists believe that the effects we associate with dark matter are actually caused by gravity.

By studying ‘relic radiation’ left over from the Big Bang, scientists can identify areas in space where more radiation exists – and more radiation means more matter. In this way, we can identify ‘hotspots’, where higher levels of dark matter may be concentrated.

It’s possible that our existing theory of gravity is flawed, and that the effects we attribute to dark matter could simply be a quirk of gravity that we don’t yet understand.

We don’t know what dark matter is made of
The majority of scientists believe that dark matter is some sort of exotic particle.

We already know about photons, electrons, quarks and many other particles, but there may be plenty of others waiting to be discovered. One or more of these unidentified particles could be responsible for effects – like gravitational lensing and the ‘spider’s web’ – that we associate with dark matter.

Dark matter might not even exist
Dark matter might be an undiscovered particle, or it might be nothing at all. Some scientists believe that the effects we associate with dark matter are actually caused by gravity.

It’s possible that our existing theory of gravity is flawed, and that the effects we attribute to dark matter could simply be a quirk of gravity that we don’t yet understand.

Spaceships are hunting for signs
So is dark matter a particle or a consequence of gravity? Well, we don’t know, and more research is needed before either theory can be proved true or false.

If dark matter particles exist, then they should occasionally collide with one another: an interaction that produces radiation. And so spacecraft have been fitted with advanced detectors to search for signs of this radiation. Some interesting results have cropped up, but the search for hard evidence is still on.

Some countries have dark matter labs hidden deep, deep underground
If hard evidence for dark matter is ever found, it will be in the form of very small, subtle effects. And so, in order to detect these tiny signals, scientists have developed dark matter laboratories deep underground, far from the effects of overpowering background noise.

In the UK, there’s Boulby Underground Laboratory: a dark matter lab in North Yorkshire, located over 1,000 metres below the Earth’s surface. And other similar facilities exist across the globe, from Canada to Australia.

We are edging closer to the truth about dark matter
There’s still a whole lot we don’t know when it comes to dark matter, and some mysteries might never be unravelled. But as technology advances, we are edging closer towards the truth.

Dark matter may be complex, elusive and mysterious, but scientists all over the world will continue the hunt – and what they find could eventually transform our very notion of the cosmos.

Dark” doesn’t just mean we don’t see it.

It means it doesn’t emit any electromagnetic radiation for all we can tell. Astronomers haven’t been able to find neither light visible to the eye, nor radiation in the radio range or x-ray regime, and not at even higher energies either.