Electromagnetic radiation can travel through "empty" space. Depending on the wavelength of the electromagnetic radiation, we call it "radio" or "microwaves" or "heat" or "light" or "UV" or "X-rays" or even "cosmic rays" - it's all different frequencies of EM radiation.
The shorter the wavelength, the higher the frequency; in fact, the frequency times the wavelength is the constant "c", the speed of light.
radiation
sound cannot travel through empty space.
Convection travels through matter. It won't travel through empty space.Convection travels through matter. It won't travel through empty space.Convection travels through matter. It won't travel through empty space.Convection travels through matter. It won't travel through empty space.
Electromagnetic waves or radiation
No, there can't be conduction in empty space. Heat may travel through empty space through radiation, though.
heat or light radiation can travel through a 100% vacuum
Electromagnetic radiation... i.e., light. Electromagnetic Waves A+
Electromagnetic waves, such as infrared and visible light
Yes, you can travel through empty space. The Sun, Earth, moon, satellites, space ships, atoms, and subatomic particles all travel through empty space. Greater than 99.999% of matter is empty space.
Gravitational (-GmM/r) and Electromagnetic (hf=hc/r) Energy.
Energy can be transferred through empty space by radiation. Joule is the SI unit of energy.
Sound waves cannot travel through an empty space because an empty space is usually a vacuum.