Question

Why is there no gravity in space?

Answer 1

Hint: There is very little air to feel whooshing past you as you fall, and there are no landmarks to indicate that you are moving. Objects tend to orbit planets instead of hitting them in space. Presence of air is necessary for the presence of gravitational force.

Complete answer:
When objects appear to be floating in space without gravity, they are actually falling for two reasons.
First, space is vast and relatively empty in comparison to Earth. When you jump off a bridge, you can tell you're falling because the air is whooshing up, the mountains are shooting up, the water is rapidly approaching, and you feel yourself hitting the water. There is little air to feel whooshing past you as you fall because space is relatively empty, and there are no landmarks to signal you are moving. Because space is so vast, it can take hours to years to fall through space and actually touch the surface of a planet (if you've aimed correctly and struck it), rather than the seconds it takes to jump off a bridge.
The second explanation for the lack of apparent gravity in space is that things tend to orbit planets rather than collide with them. Orbiting simply means that an item falls towards a planet and misses it repeatedly owing to gravity. Planets are extremely difficult to impact since space is so vast and planets are so little in contrast. Space objects usually slingshot around planets in hyperbolic routes or slip into orbits around them. To ensure that a space probe heading for the surface of Mars does not miss it, a team of scientists must do extremely precise calculations. Falling in circles around a planet rather than smashing into it may not appear to be the same kind of gravity we're used to on Earth, but it's the same kind of falling. Astronauts in low-Earth orbit do not experience "no gravity." They are subjected to nearly all of Earth's gravity, but there is nothing that can stop them. This is referred to as "free fall." To someone in a falling frame of reference, free fall appears to be floating. Scientists refer to an orbiting environment as "microgravity," which is a bit confusing.

Note:
Gravity influences the pathways taken by everything passing through space because every object in space exerts a gravitational pull on the other. It's the glue that ties vast galaxies together. Planets are kept in orbit by it.