This article is about various types of celestial bodies in the universe. The universe is the collection of different types of matter and energy.
What is Universe?
|The universe is everything that exists in space. The universe is made of voids (empty spaces) and all the matter. It including galaxies, stars, planets, and all other forms of matter and energy.|
The Universe is considered to have 3 types of substances:
(Celestial Bodies in the Universe)
What is a Galaxy?
Matter of the universe is found in the groups and clusters of galaxies. It is believed to have 100 – 200 billion galaxies in the universe.
A Galaxy is a huge collection of gases, dust, and billions of stars and their solar systems. We are part of a galaxy called the Milky Way.
Milky Way Galaxy
All the objects that are visible in the sky are called celestial bodies.
Human-made satellites are not celestial bodies.
For example, Stars, Planets, Satellites, Asteroids, Meteoroids, Comets etc.
Big bodies made of hot gases having their own light and heat.
Example: The Sun.
Bodies that don’t have their own heat and light. They are very small as compared to the stars. Planets get light and heat from the stars. Planets move around the stars.
Example: The Earth.
Smaller bodies that move around the planets.
Example: The Moon.
Small planets that move around the Sun but do not have the characteristics of a planet.
Comets are much smaller than dwarf planets. They are giant pieces of rock and ice that travel through space and release gas and dust. They look like a coma in the sky.
Very small rocky and metallic objects that travel through space. They are smaller than the comets. The diameter from 1 meter to a few hundreds of km.
Example: Asteroid belt between Mars and Jupiter.
Meteoroids are space objects that range in size from dust grains to small asteroids. They have a diameter of up to 1 meter. They come from asteroids. After entering into the atmosphere they start to glow. Then they are called a meteor.
Example: Shooting stars.
|Meteoroids (a shooting star)|
There are so many other stars that have planetary systems (Solar systems). More than 500 planetary systems have been discovered in our galaxy.