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[16/01, 12:33 pm] Pooja Mam 1: Stars
Stars are celestial bodies that emit their own light and heat. Our sun is an example of a star.
Although stars are always present in the sky but are only visible at night due to the absence of sunlight.
They appear as points as they are millions of kilometres away from us. Stars twinkle as their light gets refracted in our atmosphere.
[16/01, 12:33 pm] Pooja Mam 1: Pole star
The Pole star (or Polaris) is one star whose position seems to be fixed. All other stars seem to move around the Pole Star.
It can be traced using the constellation Ursa Major.
[16/01, 12:34 pm] Pooja Mam 1: Light year
The distance travelled by light in one year is called a light year. It is a measure of distance for celestial objects.
Speed of light \(= 3 \times 108 m/s\)
1 light year \(= 9.46 \times 1012 km\)
The sun is 8 light minutes away from earth.
The distance of Alpha Centauri is 4.3 light years away.
[16/01, 12:34 pm] Pooja Mam 1: Constellations
A group of stars that form a recognisable shape in the night sky is called as a constellation. They were devised by ancient men for navigation purposes.
Examples: Ursa major (Great bear), Orion, Leo major