1.-there are different bodies in the universe

7/25/2019 1.-There Are Different Bodies in the Universe

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Planets, like the EarthPlanets, like the Earth


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Satellites, like the moonSatellites, like the moon


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omets, !hi"h or#it theomets, !hi"h or#it the

S$nS$n


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Asteroi%s are ro"k& #o%ies' The&Asteroi%s are ro"k& #o%ies' The&

are smaller than (lanets, )er&are smaller than (lanets, )er&

o*ten irre+$lar in sha(e an% the&o*ten irre+$lar in sha(e an% the&

or#it aro$n% the S$nor#it aro$n% the S$n


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Stars, like the S$nStars, like the S$n


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ala-ies, +ro$(s o*ala-ies, +ro$(s o*

h$n%re%s o* tho$san%s o*h$n%re%s o* tho$san%s o*

stars'stars'


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Distan"es in the $ni)erseDistan"es in the $ni)erse

he dimensions of the uni!erse are sohe dimensions of the uni!erse are so

big that we need to use the followingbig that we need to use the following

units"units"

Astronomi"al $nit .AU/Astronomi"al $nit.AU/""his is thehis is the

distance between the Earth and thedistance between the Earth and the

Sun, #$% million km.Sun, #$% million km.

0i+ht1&ear .l&/0i+ht1&ear .l&/""this is the distancethis is the distancethat light tra!els in a year at its normalthat light tra!els in a year at its normal

speed &'%% %%% km per second(speed &'%% %%% km per second(


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The stars an% theThe stars an% the

+ala-ies+ala-ieshe starshe stars )f we look at the night sky on a)f we look at the night sky on a

clear night we can seeclear night we can seehundreds of small lights whichhundreds of small lights whichseem to be twinkling. hese areseem to be twinkling. hese are

the stars.the stars. Stars are large spheres ofStars are large spheres of

gas &hydrogen and helium(gas &hydrogen and helium(that release energy.that release energy.

)f we look e!en closely we can)f we look e!en closely we cansee that some of the stars seemsee that some of the stars seem

to form groups. hese are theto form groups. hese are theconstellationsconstellations. he best known. he best knownconstellations are" *rsa +aorconstellations are" *rsa +aorand *rsa +inor, -rion,and *rsa +inor, -rion,Pegasus,Pegasus,


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The +ala-iesThe +ala-ies

Galaxies are made up ofGalaxies are made up ofgroups of starsgroups of stars,, gasesgasesandanddustdust&small solid particles(&small solid particles(

Galaxies can containGalaxies can containbillions or trillions ofbillions or trillions of

stars. hese stars can alsostars. hese stars can alsocontain planetarycontain planetarysystems.systems.

-ur galaxy is called-ur galaxy is called TheTheMilk& 2a&Milk& 2a&..

Galaxies form groups ofGalaxies form groups of

galaxies / cluster ofgalaxies / cluster ofgalaxies. -ur galaxy is ingalaxies. -ur galaxy is inthethe 0o"al ro$(0o"al ro$(. he. he0ocal Group also includes0ocal Group also includesother galaxies.other galaxies.


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1epending of their shape galaxies can be"1epending of their shape galaxies can be"

Elliptic. +ore or less sphericalElliptic. +ore or less spherical

Spiral. A 2at disc with se!eral arms coming outSpiral. A 2at disc with se!eral arms coming outof the nucleus of the spiral.of the nucleus of the spiral.

)rregular. hey ha!e no speci3c shape.)rregular. hey ha!e no speci3c shape.


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Elli(ti"al +ala-iesElli(ti"al +ala-ies


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S(iral +ala-iesS(iral +ala-ies


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Irre+$larIrre+$lar +ala-ies+ala-ies

1.-there are different bodies in the universe

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