Verified answer

Heat is infra-red radiation. That is it is a type of light, hence you can feel heat in a vacuum because light can travel in a vacuum. Light is an electromagnetic wave, which does not require a medium through which it must propagate, and that is why light (and heat) can travel through a vacuum.

By radiation, every object at any temperature above absolute will radiate radiation in the electromagnetic radiation dependant on temperature and the material it's made from. If there is no incident radiation the object will cool to low temperature approaching absolute zero. Take a obvious example the sun heats the earth via radiation thru' the vacuum of space between the earth and the sun.

heat can travel through 3 ways:

1. conduction

this is when heat flows through a material from one end to the other. obviously, this is not applicable to a vacuum.

2. convection

simply put, this is when heat flows from a hotter region to a colder region. this happens with water or air, and can be forced or natural. neither is this applicable to a vacuum.

3. radiation

this is when heat travels via electromagnetic waves ( e.g. light) . this is exactly how sunlight manages to get to earth despite the large vacuum of space.

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photons ejected from nuclear fusion in the sun travel to earth...when these photons collide with molecules of gas in the atmosphere, their kinetic energy is imparted to the gas molecule (in part) which increases the energy the gas molecule has which increases its motion. The amount of motion gas molecules have bouncing off of things like you and I is interpreted by our senses as "HEAT".

It's not "heat" like you get off the stove.

It travels in space utilizing Electromagnetic Waves.