why do we have day and night ks3
A planet spins on its axis as it orbits the Sun. A
is the time it takes for a planet to turn once on its axis. An Earth day is 24 hours long. The Sun lights up one half of the Earth, and the other half is in shadow. As the Earth spins we move from shadow to light and back to shadow and so on. It is daytime in the UK when our part of the planet is lit by the Sun. And it is night in the UK when our part of the planet is facing away from the Sun. During the day, the Sun appears to move through the sky. Remember that this happens because the Earth is spinning on its axis. In the UK, if we look south and follow the path of the Sun in the sky during the day, it looks like this: The Sun appears to move from east to west.
This is because the Earth turns from west to east. The Sun appears to: One way to remember which way the Earth turns is to remember we spin, which means that we (the Earth) spins from ast. The length of the day (the time when the Sun shines on a particular part of the world) changes during the year, unless you are on the equator. Everywhere else, daytime is longest in the summer and shortest in the winter. In winter, the Sun still appears to rise in the east and set in the west, but it does not climb so high in the sky as it does in the summer. These pages have the main themes of the topic relating to the course, plus a few extra bits to help make sense of it.
You could look at books on space in the library, or search online they are loads of amazing books and web pages with information about space, the planets and stars. The photograph below is of the nights sky, look closely Most points of light that you see are stars. They are hot balls of light that emit light they are the stars that are part of our galaxy. Some of the fainter points of light are other galaxies, each with millions of stars in them. Other points of light are the planets in our solar system. They do not emit light, they reflect the suns light. The photograph was taken over a 20 second period and you can see three objects moved to give a line of light.
These were satellites man-made objects that orbit the Earth hundreds of miles up. These are also only visible because they reflect light. You may also see comets and meteors. Comets are large pieces of rock ice and dust, the size of a mountain. As they get closer to the sun some of this material gets blown off the comet and appears as a tail (left). Meteors are smaller rocks (sometime even grains of sand) that are too small to see, but burn up when the hit the atmosphere at thousands of miles an hour. (right). they are only visible for less than a second.
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