Question

What is the oldest from largest to smallest: galaxy, universe, star, asteroids, planets, moon, and solar system?

Answer 1

Hint:
i) A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter that consists of stars, stellar remnants, interstellar gas, dust, and dark matter.
ii) The word galaxy comes from the Greek galaxias, which means "milky" and refers to the Milky Way galaxy.
iii) Galaxies vary in size from dwarfs with a few hundred million (108) stars to giants with one hundred trillion (1014) stars, all sharing their galaxy's mass core.

Complete answer:
Universe, galaxies, solar system, star, earth, moon, and asteroid are listed in order of size from largest to smallest.
Explanation: Let's describe them one by one, from smallest to biggest. In truth, there are several exceptions to the size order.
Asteroid is a rocky body that orbits between Mars and Jupiter in the asteroid belt. They're usually very small objects. Ceres, the largest asteroid, has been reclassified as a dwarf planet.
In most cases, a moon is a rocky body which orbits around a sun. Some moons, such as our own, are very huge, even exceeding the size of an asteroid. Such moons are also bigger than some asteroids.
A planet is a nearly spherical body that orbits the Sun in a nearly spherical orbit. Moons are smaller than planets.
Planets surround the sun, which is referred to as a star. It is both a light and a heat source. Our Sun is a massive star that dwarfs all of the planets together.
A star and all of the planets, asteroids, comets, and other bodies make up a solar system. It is considerably larger than a star.
A cosmos, like our own Milky Way Galaxy, is made up of solar systems sharing a central centre. A supermassive black hole is found at the centre of almost all galaxies. Clusters of galaxies are large-scale systems formed by galaxies. In the world there are billions of galaxies in it.

Thus the order is ‘Universe, galaxies, solar system, star, earth, moon, and asteroid ‘.

Note:
- The word galaxy comes from the Greek word galaxas, which refers to the Milky Way's presence as a milky band of light in the sky. It was borrowed from French and Medieval Latin.
- Spiral nebulae were the first galaxies to be observed by telescope.
- Most astronomers in the 18th and 19th centuries thought of them as unresolved star clusters or anagalactic nebulae, and simply thought of them as a part of the Milky Way, but their true structure and natures were unknown.