And the British scientist at the forefront of the eerie theory claims that humans have souls which don't die along with the body.
We many not know exactly what consciousness is, but physicist Sir Roger Penrose believes that it's just a packet of information stored at a quantum - or sub-atomic - level.
Sensationally, he claims to have found evidence that this information, which is stored in microtubules within human cells, leaves the body.
Sir Roger has argued that when a person dies temporarily, this quantum information is released into the universe, only to return to the body's cells if the host is brought back to life.
He argues that this explains why people can have near-death experiences, and believes that this quantum information amounts to a soul leaving the body.
The physics expert said: "If the patient dies, it's possible that this quantum information can exist outside the body, perhaps indefinitely, as a soul."ody after a person dies.
And Sir Roger is not alone in believing this, since his theory is backed by researchers at the renowned Max Planck Institute for Physics in Munich.
Experts there argue that our physical universe is just a perception, and that once our bodies die there is an infinite life beyond.
