ur days, but it happens so slowly that it could be as much as 140 million years before the length of a day will have increased to 25 hours.</p>
    <h2>The Earth was once believed to be the centre of the universe.</h2>
    <p>Due to the apparent movements of the Sun and planets in relation to their viewpoint, ancient scientists insisted that the Earth remained static, whilst other celestial bodies travelled in circular orbits around it. Eventually, the view that the Sun was at the centre of the universe was