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Background

There is nothing in Einstein’s theories of relativity to rule out time travel , although the very notion of traveling to the past violates one of the most fundamental premises of physics, that of causality. With the laws of cause and effect out the window, there naturally arises a number of inconsistencies associated with time travel, and listed here are some of those paradoxes which have given both scientist and time travel movie buffs alike more than a few sleepless nights over the years. The time travel paradoxes which follow fall into two broad categories:

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I have always been interested in the concept of time and time travel, as it is always as mind boggling as it is simple, and this article I found useful to introduce paradoxes which arise as part of time travel.

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Wave Particle Duality

Matter and light have properties of both waves and particles simultaneously. The results of quantum mechanics make it clear that waves exhibit particle-like properties and particles exhibit wave-like properties, depending on the specific experiment. Quantum physics is, therefore, able to make descriptions of matter and energy based on wave equations that relate to the probability of a particle existing in a certain spot at a certain time.

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What is a Neutron Star?

Neutron Stars are the most dense category of stars that form when a star collapses in on itself. These stars have 1.4 solar masses (1.4 times larger than our sun) and have a radius of 6.2 miles. The reason they have the name "Neutron Stars" is also because it is believed that they are comprised of mostly neutrons.

Neutron Stars also lose the ability to generate heat because of how tightly packed the particles are against each other. Despite this surface cooling, it may still be very hot due through further collisions with other stars or an accretion (a gravitationally bound disk of particles).

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