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Galaxies are vast systems that consist of stars, stellar remnants, interstellar gas and dust, along with dark matter, all bound together by gravity. They can vary in size and shape, and they typically contain millions to trillions of stars along with other astronomical objects.

Planetary systems are groups of celestial bodies that orbit a star, with planets being the most prominent members of the system. A planetary system typically includes: 1. **Stars**: The central body is usually a star (or stars, in the case of binary or multiple star systems) around which the rest of the system orbits. 2. **Planets**: These are large celestial bodies that orbit the star.

A star system, often referred to as a stellar system, is a group of celestial bodies that are gravitationally bound to a central star. The most recognizable type of star system is a solar system, which includes a star (or multiple stars in the case of binary or multiple star systems) and various objects such as planets, moons, asteroids, comets, and meteoroids that orbit the star.

The binary system is a numerical system that uses only two digits: 0 and 1. It is a base-2 numeral system, as opposed to the decimal (base-10) system that uses ten digits (0 through 9). In the binary system, each digit represents a power of 2, depending on its position in the number.

The Poincaré and the Three-Body Problem refers to a significant area of research in dynamical systems and celestial mechanics. The "three-body problem" itself is a classic problem in physics and mathematics that seeks to understand the motion of three celestial bodies under their mutual gravitational attraction. ### The Three-Body Problem The three-body problem asks how three bodies, such as stars or planets, will move in space given their initial positions and velocities.

In astronomy, "tug of war" refers to the gravitational interactions between celestial bodies, particularly in a system involving multiple massive objects, such as stars or planets. This term can describe the competition between gravitational pulls from different bodies that can affect their orbits, trajectories, or stability in a system.

The universe refers to the vast, all-encompassing expanse that includes everything that exists, such as matter, energy, planets, stars, galaxies, and even the cosmic laws and forces governing them. It is often described in terms of the following key points: 1. **Scope**: The universe contains all celestial bodies and cosmic phenomena, including the Milky Way galaxy, other galaxies, nebulae, black holes, and dark matter.