There are many things in the Universe which are hard to be believed but this time researchers in the US say they've created a fluid in the lab, which has the negative mass and it is exactly as mind-bending as it sounds. It is not like other physical objects as it moves backwards when you push this fluid instead of moving forward. This type of odd behaviors of physical objects usually happens within neutron stars and black holes. How is it possible that something has negative mass?
If we take this theoretically it is easy to understand this concept. Matter can have a negative mass same as an electric charge can be either positive or negative.
But it is only looks good on paper in reality it is pretty debatable concept that, whether negative mass objects can really exist without breaking the laws of physics or not?
Isaac Newton's Second Law of Motion is often written as the formula f=ma, or force equals an object's mass times its acceleration.
According to this formula if mass is negative then acceleration would also be negative and it is very hard to understand that with negative acceleration, just imagine sliding a glass across a table and having it push back against your hand.
Though, just because we find this unusual doesn’t mean it’s impossible, and a research also proved that negative mass can exist without breaking the laws of physics.
Some physicists think that negative mass could be as weird as dark energy, black hole and neutron stars.
As a result, researchers have been actively trying to recreate negative mass in the lab, with some early success.
But now researchers from Washington State University say they've successfully managed to get a fluid of super chilled atoms to act as though it has negative mass - and suggest it could finally be used to study some of the stranger phenomena happening in the deep Universe.
Michael Forbes one of the researchers, said: "What's a first here is the exquisite control we have over the nature of this negative mass, without any other complications.”
Team used lasers to cool rubidium atoms to a fraction above absolute zero, creating what's known as a Bose-Einstein condensate, to create this strange fluid.
In this state, particles move incredibly slowly and follow the strange principles of quantum mechanics, and start to behave like waves.
The particles also sync and make superfluid, a substance that flows without losing energy to friction and to keep this fluid this fluid in icy temperatures, they used lasers.
While the superfluid remained contained in that space it had regular mass and, as far as Bose-Einstein condensates go, was pretty normal.
But then the team forced the superfluid to escape, with the help of a second set of lasers, they kicked the atoms back and forth to change their spin, breaking the 'bowl' and allowing the rubidium to come rushing out so fast that it behaved as if it had negative mass.
Forbes said: "Once you push, it accelerates backwards, it looks like the rubidium hits an invisible wall."
Researchers said that this is in early stages and need some more research on it. They need something more to prove that this escaping superfluid is enough to prove the concept of negative mass and before we get too excited, other teams need to replicate the results independently.
But the research has now been published in the peer-reviewed journal Physical Review Letters for anyone to try their hand at.
So hopefully it won't be long before we see the experiment recreated.
One thing's for sure, physics just keeps getting weirder, and we're pretty excited to see what happens next.