Without the force of gravity, the intense pressures at the core of the sun would cause it to burst open. The same fate would befall other stars in the Universe. Eventually, there would only be a diffuse soup of atoms and molecules drifting around.
While this scenario is impossible, it helps to illustrate just how fundamental gravity is to the Universe.
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There is good reason to believe the human body would develop differently.
If gravity was not around, our heart, muscles and bones would have nothing to respond to, and our organs would develop in other ways.
While physicists are convinced that we could never switch gravity off, we can still explore the idea.
Without gravity, our bodies would change. After a short visit to space, astronauts lose bone mass and muscle strength, and their sense of balance changes. Their red blood cell count falls, causing "space anaemia". Wounds take longer to heal, the immune system weakens, and sleep is disturbed.
Scientists know four forces - things that attract or repel one object from another. The strong force and the weak force operate only inside the centres of atoms. The electromagnetic force rules objects with excess charge, and gravity directs objects with mass.
People have long speculated about gravity. While ancient Greek and Indian philosophers observed gravity, it was the insight from Isaac Newton that made it possible to measure and predict the phenomenon.
Newton’s Third Law Of Motion, which states that every action has an equal and opposite reaction is the heart of rocket science.
The basics of rocket science are not that complicated, only involving getting the moving force that overcomes the pull of gravity, in a calculated and controlled manner.
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