science ppt (1)
TRANSCRIPT
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Science
Presentation
Topic : Stars And Constellations
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Stars Starsyou see thousands of them every timeyou look into the
night sky. Well, that is if you bother to even notice them. They aresort of
like trees, or houses; they are there every time you look, somost people take their presence for granted and never give them asecond thought. To help you understand what you are looking at inthe sky, here are a few fun facts about stars.
When you look into the night sky, all of the stars appear to bewhite, but they are not. Stars come in many colors: blue, brown,yellow, red, and orange to name a few. Within each of those colorsthere are several subcategories like giant and dwarf and a few waysto classify the age of a star.
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Stars create energy in one of two ways. The firstis converting h
ydrogen to helium in a proton-protonchain reaction basis(P-P) or the CNO cycle
(carbon-oxygen-nitrogen cycle)where they convertcarbon to nitrogen to oxygen to convert hydrogento helium(CNO cycle).
Our Sun is a single star. It stands alone near thevery center of our Solar System. That gives somepeople the impression that this is how things areevery where in the universe, but many stars occur
in groups. There are many binary(two) star systemsand some known to have as many as 6 in a system.
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constellations
A constellation is a group of stars that, when seen fromEarth, form a pattern. The stars in the sky are dividedinto 88 constellations.The brightest constellation is Crux(the Southern Cross). The constellation with the greatestnumber of visible stars in it is Centaurus (the Centaur -
with 101 stars). The largest constellation is Hydra (TheWater Snake) which extends over 3.158% of the sky.
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There are also asterisms, smaller apparent star
patterns within a constellation, like the Big
Dipper(in Ursa Major), the Little Dipper(in Ursa
Minor), Keystone (in Hercules), and
the Pleiades (in Taurus).
Big Dipper
Ursa Major
Pers
eus
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Orion the hunter Taurus
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The 12 Constellations of the Zodiac
The zodiac is a band of 12 constellations
along the ecliptic.Aquarius, the water bearer
Aries, the ramCancer, the crabCapricorn, the goatGemini, the twinsLeo, the lionLibra, the scalesPisces, the fishSagittarius, the archerScorpius, the scorpionTaurus, the bullVirgo, the virgin.
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questions
Will the stars appear to twinkle for an
astronaut who looks at them in space?
Ans: Stars are very far away from us
hence, appear as very tiny dots. The
light coming from them takes many
years to reach us. Also, the ray of light
bends when it enters the earthsatmosphere. Hence, the twinkling effect.
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What does CNO in the CNO cycle standfor?
Ans: carbon-nitrogen-oxygen How many constellations are there
belonging to the zodiac?
Ans: 12
Which is the largest constellation?Ans: Hydra, the water snake
There are how many known constellations?
Ans: 88
Are the stars white?Ans: No, they only appear to be white but are
in different colours like brown, yellow, orangeand more.
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bibliography
Info from class VIII science in everyday
life textbook, encyclopedia,
www.answers.com, wikipedia and
NCERT class VIII science textbook
Pictures from www.google.com
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contribution
Information and editing Mehak
Write-up Gunjan
Animation and beautification - Roweena
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Presented by :-
Mehak Roy
Gunjan mehlawat
roweena verma
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THANK YOU