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Is there gravity in space?
The absence of gravity in space is not really true, since gravity is everywhere. This force is the planetary orbits, the solar system and galaxies. The force of gravity from the sun reaches the solar system and beyond, keeping the planets in their orbits. The Earth's gravity keeps the moon and artificial satellites orbiting around it.
It is true that gravity decreases with distance, according to the equation of gravitational attraction of two masses or two objects, since the higher the distance of two objects, the lower the force of gravitational attraction. Therefore, you may be away from a planet or a star and feel less gravity.
There is where the masses of the bodies involved, and that the more mass possess greater will be the attraction. Indeed, were it not for the pull of gravity, the planets are revolving around the sun would come out fired, but because of their mass and balance that occurs between the centrifugal forces (pushing toward the Sun) and centripetal (which ejected out), these still remain in their orbits.
But the reason for the astronauts feel less gravity in space travel is in your situation compared to their spaceship. On Earth we feel the weight because gravity pulls us while we ground pressure, which stops us from falling deeper. Any space station in orbit around the Earth falls slowly towards the planet. As the station and the people who are in the same down to the same speed, the astronauts did not put pressure on anything, so feel lighter.
something we feel if we are descending on a roller coaster or elevator motion fast. When we descend rapidly, so do the roller coaster car or elevator, and for a second we feel less light.
Space stations are about 350-400 km. of the Earth where the gravity is still 90% to which we have on the surface of our planet. The astronauts feel weightlessness because the ship on which they travel must keep traveling at a certain speed to stay in orbit around the Earth in a controlled manner. For example, the International Space Station travels at about 27,720 to 27,360 kilometers per hour (7.7 - 7.6 km / s.)
What about deep space than any star or galaxy? For example, at any point midway between where we are and the Andromeda galaxy. One may think that gravity does not exist in this space, but there is really zero gravity. The force of gravity would be too weak, but never reach a zero point. In fact, the gravitational force between galaxies orbiting often cause between them.
There is a weak gravity in deep space because the gravitational forces become smaller the higher the distance between objects, but never reach a zero point. Although remote space forces are smaller, are always present.
Compared with other elemental forces of nature (electromagnetic force, weak nuclear force and strong), the force of gravity is quite weak. Still, this is a fundamental force of the most powerful, gravity is everywhere in the universe.
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