The muscles and correct posture maintain the natural spinal curves. Good posture involves training your body to stand, walk, sit, and lie so that the least amount of strain is placed on the spine during movement or weight-bearing activities (see Posture).
There are roughly 500 billion galaxies in the universe, meaning there is somewhere in the region of 50,000,000,000,000,000,000,000 (5Ã1022) habitable planets. Iâll leave you to do the math on whether one of those 50 sextillion planets has the right conditions for nurturing alien life or not.
The number of planets pre 1801 : 7. Of course before the discovery of Ceres (1801), the number of planets was 7: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus. The number of planets pre 1781 : 6 or 8? Before 1781 when Uranus was discovered, there were 6 planets - all of which are visible to the naked eye and were known to the ancients.