noun a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
In astronomy, a galaxy is a massive collection of stars, dust, and gas bound together by gravity.
Galaxies are objects of interest in space exploration, as scientists study their formation and evolution.
In science fiction, galaxies are often portrayed as vast, unexplored regions of space inhabited by various alien species.
Galaxies play a key role in astrophysics, influencing the study of dark matter, dark energy, and cosmic evolution.
In cosmology, galaxies are studied as fundamental building blocks of the universe.
In science fiction writing, the term 'galaxy' is often used to refer to a massive system of stars, stellar remnants, interstellar gas, dust, dark matter, and other objects bound together by gravity.
Astronomers study galaxies to understand their formation, evolution, and interactions with other galaxies. They use telescopes and other instruments to observe galaxies in different wavelengths of light.
Astrophysicists study the physical properties and processes of galaxies, such as their structure, dynamics, and composition. They use mathematical models and simulations to understand how galaxies form and evolve over time.
Cosmologists study the large-scale structure and evolution of the universe, including galaxies. They use observations of the cosmic microwave background, galaxy redshift surveys, and other data to develop theories about the origin and fate of galaxies.
In science education, the term 'galaxy' is used to teach students about the vastness of the universe and the different types of galaxies, such as spiral, elliptical, and irregular galaxies. Educators may use visual aids, such as images and videos, to help students understand the concept of galaxies.