Celestial Bodies in the Universe

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:

  1. Normal Matter
  2. Dark Matter
  3. Dark Energy
Celestial Bodies in the Universe
Universe

Normal Matter

  • It includes all the atoms that makeup stars, planets, animals, plants, and every visible object in the Universe.
  • Approximately, 5% of the universe is normal matter.

Dark Matter

  • The mysterious, invisible substance of the universe is called dark matter.
  • Approximately, 25% of the universe is dark matter.

Dark Energy

  • Mysterious energy or force that affects the universe. It is the opposite of gravity and it is expanding the universe.
  • Approximately, 70% of the universe is dark energy.

(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.

Celestial Bodies in the Universe
Milky Way Galaxy

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.
Stars

Big bodies made of hot gases having their own light and heat.

Example: The Sun.

Celestial Bodies in the Universe
 
 
 
Planets
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.
Celestial Bodies in the Universe
Satellites
Smaller bodies that move around the planets.
Example: The Moon.
Celestial Bodies in the Universe
Dwarf Planets
Small planets that move around the Sun but do not have the characteristics of a planet.
Example: Pluto
Comets

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.

Comet
Asteroids
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.
Asteroid Belt

 


Meteoroids
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)
Our galaxy has more than 200 billion stars. Sun is one of these stars. Sun has its own planetary system which is called the Solar System.

There are so many other stars that have planetary systems (Solar systems). More than 500 planetary systems have been discovered in our galaxy.

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