Everything in the universe is made up of what?

The correct answer is matter. Matter is defined as anything that has mass and takes up space, which encompasses all physical substances in the universe, including solids, liquids, gases, and plasma. Every tangible object, from planets to people to particles, is made of matter.

Energy, light, and sound, while integral to the universe and connected to the behavior and interactions of matter, are not themselves classified as matter. Energy refers to the capacity to do work or produce change, and it can exist in various forms such as kinetic, potential, thermal, and electromagnetic. Light, a form of electromagnetic radiation, is a manifestation of energy and is not tangible. Sound, meanwhile, is a mechanical wave that propagates through a medium but does not have mass or occupy space in the same way matter does. Therefore, matter is the fundamental building block that encompasses all substances in the universe, making it the correct choice.