IF WE look at the sky on a clear night ,we can see the distant stars and constellations and usually the moon .Some times we can also see comets or shooting stars , and on seeing them we quickly make a wish .It is believed that a wish .With the help of a telescope ,we can see many more stars than we do with naked eye.Astronomers observe the sky with a telescope and keep discovering new stars and galaxies.
Most of us think that all points of light in the sky are stars .But this is not always true .Some of the bright point of light may be planets,which are radiate by the sun,some may be remote galaxies ,collection of many stars.Unlike the moon and the planets , star shine by producing their own light .Some stars shine strongly and some weakly .The energy for shining is generated inside the core of the stars.Our sun is also a star and is relatively small in composition to other stars.
CONSTELLATIONS- THE Ancient Greeks found some patterns when they observed stars.They found that eight stars together looked like a whale, while some other stars seemed to resemble a lion or a bear.They put together these groups of stars as pictures, many of which we hardly track these days.The reason is that the stars have changed positions in the 3000 years that followed after the Greek first observed the constellations .However ,the following constellations can be seen very clearly in the northern hemisphere;PISCES,(1),ARIES(2), TAURUS(4) ,CASSIOPEIA (5)
Perseus(6). Auriga(7) ,Orion (8), Gemini (9), Lynx(10) ,Cancer(11) ,, Little dipper(14) ,Draco (15),Herdsmen(16) ,Hercules (17) , and Ophiuchus(18)
HOW FAR AWAY ARE THE ST ARS FROM US.-Most of the stars are billions of kilometers away from us .Astronomers specify distances in space in in unit caled light year. A light year is a distance covered by light in one year . The speed of light is 300,000km /s.Proxima Centauri , the star nearest to sun , is 4.2 light years away from the Earth.
CONSTELLATIONS-
Most of us think that all points of light in the sky are stars .But this is not always true .Some of the bright point of light may be planets,which are radiate by the sun,some may be remote galaxies ,collection of many stars.Unlike the moon and the planets , star shine by producing their own light .Some stars shine strongly and some weakly .The energy for shining is generated inside the core of the stars.Our sun is also a star and is relatively small in composition to other stars.
CONSTELLATIONS- THE Ancient Greeks found some patterns when they observed stars.They found that eight stars together looked like a whale, while some other stars seemed to resemble a lion or a bear.They put together these groups of stars as pictures, many of which we hardly track these days.The reason is that the stars have changed positions in the 3000 years that followed after the Greek first observed the constellations .However ,the following constellations can be seen very clearly in the northern hemisphere;PISCES,(1),ARIES(2), TAURUS(4) ,CASSIOPEIA (5)
Perseus(6). Auriga(7) ,Orion (8), Gemini (9), Lynx(10) ,Cancer(11) ,, Little dipper(14) ,Draco (15),Herdsmen(16) ,Hercules (17) , and Ophiuchus(18)
HOW FAR AWAY ARE THE ST ARS FROM US.-Most of the stars are billions of kilometers away from us .Astronomers specify distances in space in in unit caled light year. A light year is a distance covered by light in one year . The speed of light is 300,000km /s.Proxima Centauri , the star nearest to sun , is 4.2 light years away from the Earth.
CONSTELLATIONS-
- INTERESTING FACTS- There is a term called ' light pollution'. It refer to the artificial lights of the cities that illuminate the night sky and create difficulties for the astronomers in studying the night sky.
- STARS-
- The flag of Australia features a constellation on it.This constellation is called the 'Southern cross'we can see it only when we are in the southern hemisphere .It is never visible over Europe.
Comments
Post a Comment