Why there isn't any gravity in Space?

The notion that there is no gravity in Space is wrong.
Gravity is known to be present everywhere. The presence of gravity in Space is beyond human understanding. According to popular notions, astronauts feel weightlessness in Space because the effect of the Earth's gravity on astronauts in outer space is far lesser than what humans feel on Earth. As Space is a vacuum, we cannot feel the gravity acting on us. Earth has air and other dust particles that hit us while falling at a high velocity.

The strength of gravity varies on every celestial body present in the solar system. As we move away from the Earth and towards another celestial body, the gravity of the Earth reduces and is overpowered by the celestial body at the destination. Physicists suggest that everything in Space is continuously falling. This fits perfectly with the presence of gravity in Space acting on all these celestial bodies.

So there is gravity everywhere in Space and it is continuously acting on us. For everything in Space, there is a central force around which everything rotates. From what we have seen till now, planets revolve around stars and stars revolve around black holes. I would also consider black holes to be revolving around something bigger and who knows even Space might be having the same characteristic.

Quantifying Space is extremely difficult for us but it isn't impossible. Travelling faster than the speed of light will allow you to overtake the expansion of Space allowing you to see whats beyond Space.

Thanks for reading!