Gravity keeps everything in orbit
- rotation means spinning – stars spin, planets spin, moons spin and galaxies spin – even atoms spin.
- our Earth takes 23 hours 56 minutes and 4.2 seconds to make one rotation around itself.
- fastest-rotating planet is Jupiter – turns around once every 9.84 hours.
- slowest-rotating planet is Venus – takes 243 days to turn around.
- our sun takes 25.4 days to rotate.
- space objects also move around each other – moons orbit planets, planets orbit stars and stars orbit the centre of galaxies.
- our Earth’s movements are not actually felt because everything is moving with it – however Earth’s spin can be seen as our Sun, Moon and stars move across the sky.
- gravity keeps everything in orbit – our Sun’s gravity pulls our Earth and Earth’s gravity pulls the Moon.
Did you know?
- The fastest-spinning objects in the Universe are neutron stars – these can rotate 500 times in just one second!