Black holes remain one of the most mysterious entities in the universe, but what is known of them is terrifying. They completely break the laws of physics with their singularity at the centre, which is a one-dimensional point where gravity becomes infinite and space and time become curved. The only other point in nature where a singularity existed is at the Big Bang.

This is why NASA believes black holes could be a portal to another reality where you experience space and time in a completely different way.

NASA said on its website: For black holes, distant observers will only see regions outside the event horizon, but individual observers falling into the black hole would experience quite another reality.

If you got into the event horizon, your perception of space and time would entirely change.

The perception would change because, in the universe, space and time are intertwined, called space-time.

However, gravity stretches space-time and objects with a large mass will be able to stretch space-time to the point where it is unrecognisable, known as time dilation.

The more mass an object has, the more it stretches and slows down time so something as large as Sagittarius A* the gigantic black hole at the centre of the galaxy would be able to stretch time to a point where it almost comes to a complete standstill.

Sagittarius A* has a radius of 22 million kilometres and a mass of more than four million times that of the Sun.

In other words, it is very dense.

READ MORE:Time travel BREAKTHROUGH: Time can be stopped and this is how

And because it is so heavy, it has the ability to completely stretch out space-time to a point where one minute on the edge of Sagittarius A* will see 700 years pass on Earth, Emma Osborne, an astrophysicist at the University of Southampton, said.

However, anyone hoping to get close to a black hole and experiencing this phenomenon is out of luck.

Firstly, there is no chance that one would survive falling into a black hole, so time travelling would be futile.

This is due to a process called spaghettification. The immense gravitational pull is so strong that the force is much stronger at the base than the top.

DON'T MISSHow falling into a black hole would leave you frozen in time'[ANALYSIS]Black hole with power of 100 Suns is flickering in Milky Way[RESEARCH]Black hole warning: Scientists spark fears over ancient black hole[COMMENT]

For example, if you were travelling feet first into a black hole, the gravity be so strong you would literally be spaghettified, and you would be stretched out to a point where you would just be a stream of atoms heading towards the centre.

Another impossible hurdle to overcome would be getting to a black hole.

The nearest black hole to our planet is located 6,523 light-years away one light-year is 5.88 trillion miles.

The farthest humans have been from Earth is 248,655 miles (400,171 km) in 1970 as part of NASAs Apollo 13 mission when the craft swung around the far side of the moon it took almost three days to get there.

More:

NASA reveals how falling into black hole would be portal to another reality - Express.co.uk