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Stars
A star is a luminous globe of gas consisting of mainly hydrogen and helium which produces its own heat by nuclear reaction, stars shine for many billions of years although they have been found to have changed in appearance and size. We can see stars from earth because they are bright and glowing, it is a luminous globe of gas, the temperature rises as dust grains radiate much of the heat, but as it grows denser less of the heat generated can escape and it warms up. When the star is about 10 million degrees Celsius the temperature is very hot, high enough for a nuclear reaction to begin, vast amounts of energy are released, contraction stops and the star shines.
Constellations
As seen from the Earth, all the historic planets are conspicuous naked-eye objects moving in looped paths against the stellar background. The size of these loops, which are caused by the Earths own motion round the Sun, are inversely proportional to the planets distance from the Earth. The constellations are totally imaginary things that poets, farmers and astronomers have made up over the past 6,000 years (and probably even more!). The real purpose for the constellations is to help us tell which stars are which, nothing more. On a really dark night, you can see about 1000 to 1500 stars. Trying to tell which is which is hard. The constellations help by breaking up the sky into more manageable bits. Around the world, farmers know that for most crops, you plant in the spring and harvest in the fall. But in some regions, there is not much differentiation between the seasons. Since different constellations are visible at different times of the year, you can use them to tell what month it is. For example, Scorpius is only visible in the northern hemispheres evening sky in the summer. Some historians suspect that many of the myths associated with the constellations were invented to help the farmers remember them. When they saw certain constellations, they would know it was time to begin the planting or the reaping. The nearest star, Proxima Centurai (part of the Alpha Centurai group) is just over four light years away. The diameter of the orbit of this comet cloud would be about 00,000 Astronomical Units, or two and a half light years.
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Day and Night
The earth spins on its axis every 4 hours, the side of the earth nearest to the sun is lit up by the suns light so this side is having daytime, the other side is in darkness so this side is having night time. A day lasts for 1 hours and a night for 1 hours so altogether 4 hours make up day and night. In June and the summer months the days are long and the nights are short whereas in December and the winter months the days are short and the nights long.
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