Universe is only empty space?

Answer is: Vast empty space around us that consists of stars, solar system, galaxies etc is called Universe.

Major components are:

1.Solar system- Basically the name solar system is describing the sun’s family. The sun occupies the centered place. Around the sun the remaining nine planets revolve around in different orbits.  As the planets came near to the sun their rotation speed goes on increasing. The motion of all the planets is controlled by the sun’s gravitational pull.

Ordered list of all 9 planets is given below:

1. Mercury

2. Venus

3. Earth

4. Mars

5. Jupiter

6. Saturn

7. Uranus

8. Neptune

9. Pluto

Above list of planets is arranged according to the increasing distances of the planets from sun.

How to recall the list of planets? Remember this:

My Very Educated Mother Just Served Us Nine Pizzas

Lots of other satellites are present in the universe which usually revolves around the planets of the solar system. Moon is also a satellite. It is the natural satellite of earth. Meteors, Asteroids and comets are also part of the solar system.

2. Galaxies: Galaxies are formed by group of starts, gases, and dust particles all are together by strong gravitational forces. Milky Way is one of the galaxies of the universe in which we live. It is also called Akashganga. It appears like an unclear white strip of light elongated across the sky.  

A Milky Way galaxy contains billions of stars, near about -10¹¹. Like Milky Way lots of other galaxies exist in the Universe. The galaxy count is approximately 10¹¹.

3. Stars: Stars are glowing heavenly bodies. Stars emit light due to their high temperatures. The nearest star to us the sun. Stars can be seen on a clear night.   On a clear night at a single time the number of stars we can see is near about 2500. The second brightest star is Alpha Centauri. The approximate distance of the star Alpha Centauri from earth is near about 4.3 light years.

The universe is keep on expanding at the speed of 26.71 lakhs kilometer per hour