If there is no gravity in space why don’t the planets fly away?

Answer

There is indeed gravity in space. Between any two objects (for example: people, planets, stars …) there is gravity. Sometimes it is very small, such as between two people. Gravity increases as the mass of the objects increases. Thus the Earth will exert a much greater force on you than the gravity that exists between two people. Conversely, you will exert the same force on the Earth, but because the Earth is so much heavier than you, you will not notice it.

If we now look at the planets, then they also feel gravity. They are mainly attracted to the sun, the heaviest object in our solar system. You might think that all planets would then move towards the sun. Fortunately that doesn’t happen. This is because the planets revolve around the sun. It’s basically like they fall “next to” the sun every time. You can compare it a bit with a ball on a rope that you spin quickly. Here the force that the rope exerts on the ball is comparable to the gravity between the sun and the planets.

If an astronaut walks on the moon, he will be attracted to the moon by gravity. Because the moon has less mass than the Earth, its gravity is about six times smaller. This allows astronauts to jump much higher on the moon than here on Earth. I hope this answers your question?