What travels outward from a light source in all directions?

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Photons travel outward from a light source in all directions. Photons are the fundamental particles of light and other forms of electromagnetic radiation. When a light source, such as a bulb or the sun, emits light, it releases photons that move through space at the speed of light. These photons carry energy and information about the light, allowing us to perceive it.

Radiation waves is a broader term that encompasses various types of electromagnetic radiation, including light waves. While this choice seems relevant, it does not specifically identify the particles responsible for light travel like photons do. Electrons, on the other hand, are charged particles that are part of atoms and are not the same as light. They do not emanate from a light source in the same way that photons do. Sound waves are mechanical waves that require a medium to travel through, such as air or water, and they do not propagate through the vacuum of space in the same manner as light. Thus, the most precise answer that directly relates to light traveling in all directions is photons.