atom: The basic unit of a chemical element. An atom consists of a dense nucleus containing positively charged protons and uncharged neutrons. A cloud of negatively charged electrons orbits the nucleus.
big bangCurrent theories suggest that the origin of the universe was characterized by dense matter and the rapid expansion of space-time, a theory that is supported by astronomers' current understanding of the universe's composition and structure.
Space: An adjective referring to the universe, i.e. the cosmos and everything in it.
Cosmic Microwave Background: A type of radiation that fills the universe with a faint glow. It appears to flow in all directions with equal intensity. It is heat left over from the Big Bang and should be present throughout the universe. It is estimated to be about 2.725 degrees above absolute zero.
universe: (adjective: cosmic) A term referring to the universe and everything in it.
density: A measure of how condensed an object is, calculated by dividing its mass by its volume.
electromagnetic: An adjective referring to light radiation, magnetism, or both.
Electromagnetic spectrum: A range of radiation ranging from gamma rays and X-rays to visible light and radio waves. Each type of radiation in the spectrum is usually classified by its wavelength.
Electronic: Negatively charged particles that usually orbit the outer regions of atoms and are also carriers of electricity in solids.
Kelvin: A temperature scale with units of the same size as the Celsius scale. The difference is that 0 Kelvin is absolute zero. Therefore, 0 Kelvin is equivalent to -273.15 degrees Celsius. In other words, 0 degrees Celsius is equivalent to 273.15 Kelvin. Note: Unlike the Celsius and Fahrenheit scales, the Kelvin scale does not use the term “degrees” for numbers.
Case: Something that occupies space and has mass. Everything that has matter on Earth has a property called “weight.”
Opacity: It is not see-through and blocks light.
particle: A trace of something.
plasma: (in chemistry and physics) The gaseous state of matter in which electrons have separated from atoms. Plasma contains both positively and negatively charged particles.
proton: A subatomic particle that is one of the basic building blocks of atoms that make up matter. Protons belong to a group of particles called hadrons.
spectrum: (plural: spectrum) a range of related things occurring in a certain order; (in light and energy) the range of types of electromagnetic radiation, ranging from gamma rays to X-rays, ultraviolet light, visible light, infrared energy, microwaves, and radio waves.
Star: The basic building blocks from which galaxies are made. Stars form when gravity compresses gas clouds. When a star becomes hot enough, it emits light and other forms of electromagnetic radiation. The Sun is the closest star to us.
telescope: A light concentrator that makes distant objects appear closer, usually using a lens or a combination of curved mirrors and lenses, although some also collect radio radiation (energy from different parts of the electromagnetic spectrum) via a network of antennas.
universeThe entire universe: everything that exists across space and time. The universe has been expanding ever since it was formed in an event called the Big Bang about 13.8 billion years ago (with some margin of error of a few hundred million years).
wave: Disturbances or changes that travel in a regular vibrational manner through space and matter.
Source: www.snexplores.org
