A system consisting of a spiral galaxy surrounded by several dwarf white galaxies, often ellipticals. Our galaxy and the Andromeda galaxy are examples of hypergalaxies.

A gigantic ball of ice and rock that orbit the Sun in a highly eccentric orbit. Some comets have an orbit that brings them close to the Sun where they form a long tail of gas and dust as they are heat [..]

A layer of gases surrounding a planet, moon, or star. The Earth's atmosphere is 120 miles thick and is composed mainly of nitrogen, oxygen, carbon dioxide, and a few other trace gases.

The distance between consecutive crests of a wave. This serves as a unit of measure of electromagnetic radiation.

The apparent shift of the celestial poles caused by a gradual wobble of the Earth's axis.

An explosion of hot gas that erupts from the Sun's surface. Solar prominences are usually associated with sunspot activity and can cause interference with communications on Earth due to their ele [..]

A high plain or plateau.

A fundamental particle produced by the nuclear reactions in stars. Neutrinos are very hard to detect because the vast majority of them pass completely through the Earth without interacting.

A low plain.

A shell of gas surrounding a small, white star. The gas is usually illuminated by the star, producing a variety of colors and shapes.