unit 1,chapter 1 (science b)

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what are telescopes used to detect?
visible light and any other electromagnetic radiation
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whats good about ground based telescopes?
can be maintained and visited regularly
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what do some stars emit?
radio waves
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what do ground based telescopes detect?
visible light,raidowaves,microwaves
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what do space based telescoped detect?
visible light,inferred,ultra violet
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whats the doopler effect?
waves from objects moving away from an observer appear to stretch
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whats the difference between red light and blue light?
red light has a longer wave length than blue light
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whats red shift?
when a star or galaxy moves away from us it appears redder because its wavelength has stretched
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whats cosmic background radiation?
this is proof that the big bang took place. and is a weak microwave signal arriving from earth at all directions
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what are stars made from?
stars are made from immensley hot glowing gas
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whats the path called that a planet does?
an orbit around a central star
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whats a planets orbit called?
an ellipse
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what was the earth orignially?
a ball of molten rock,which slowly cooled down to form a crust.
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whats beneath the crust?
the mantle
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whats the centre of the earth called and made of?
the core. made from iron and nickel
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whats on the outer and inner core?
outer core is molten liquid and inner core is soild
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what do nuclear reactions deep inside the earth do?
heat up the mantle
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whats does heat from the earths core do?
causes convection currents in the mantle which causes tectonic plates to move
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what happens when one plate slips under another one?
starts to melt
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what does the molten rock then sometimes do?
rises back to arts surface causing a volcano
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what happens when the plates slide past each other with a strong force?
they suddenly slip past each other causing an earthquake
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what gases were in the earths early atmosphere?
water vapour,small proportion of ammonia,hydrogen and methane.this mixture of gases was shown to be capable of making amino acids. in experiments in 1950's carried out by miller and urey
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what did the water vapour do in the earths early atmosphere?
cooled down and condensed into the oceans. and early plants and algae began to evolve
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what was the earths early atmosphere produced by?
volcanoes. and was mainly carbon dioxide
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whats does the earths atmosphere contain NOW?
nirogen, oxygen with small amounts of carbon dioxide and water vapour
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what does short wave radiation do to the earths atmosphere?
light energy from the sun passes through the atmosphere to warm the earth
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what happens when the earth warms up?
releases energy into space as long wave radiation which is absorbed by green house gases
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what can too much green house gases do?
warm p the earth and cause global warming and extreme weather patterns called CLIMATE CHANGE.
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Other cards in this set

Card 2

Front

whats good about ground based telescopes?

Back

can be maintained and visited regularly

Card 3

Front

what do some stars emit?

Back

Preview of the front of card 3

Card 4

Front

what do ground based telescopes detect?

Back

Preview of the front of card 4

Card 5

Front

what do space based telescoped detect?

Back

Preview of the front of card 5
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