space & its mysteries summary
TRANSCRIPT
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Space and Its
MysteriesTopic Summary
Science Department10 November 2009
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Gravity
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Mercury
VenusEarth MoonMars
JupiterSaturn
UranusNeptune
Pluto
On Earth, we are used to gravitykeeping things held down. But, gravity
also keeps moving in circles (or nearly circles - an oval shape called an
ellipse). Earths gravitykeeps the moonand our satellites in orbit.
The Suns gravitykeeps theEarth and the other planets in orbit. The
gravityof our Milky Waygalaxykeeps our Sun and thebillions of
otherstars together.
Mass & Weight
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ThisistheMars
roverwhich
roamsaroundthesurfaceofmars,
collectingsamples,doi
ngtests...
andsendingsignalsbacktoan
orbitingsatellite...
...whichsendsthembacktosci
entistsonEarth.These
satellitescanalsotakemeasurementsandphoto
softhe
surfaceofplanets.Thisisacra
teronMars.
Telescopesareusedforlookingatplanets,moons,asteroids
comets,oursun,otherstarsandgalaxies.Thebiggestandbest
areabovethecloudlevelinremoteplaceswithgooddarknightskies.
Radiotelescopesallowastronomer
stoseethroughdustclouds
(nebulae).Theyarealsousedforlisteningforradio
signalsfrom
possibleintelligentlifeintheSETIprogram
Someroboticcraftlandbutdontmoveabout. Theyarecalledlanders.
TheHubbleSpacetelescopeorbitsabout400kmabovethe
Earth. Itgetsgreatviewswithno
streetlight,badweatherorpollutiontogetintheway.
We dont have to always go somewhere to find out about it.Here are someof the ways that scientistscan find out
How we know so much stuff...
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Cometsareballsoficeand
rockthatgoroundthe
suninovalpathscalledel
lipses.Theseare
generallysmall,sayafew
tensofmetresacross
andaboutthesamesizea
sthesmallest...
...moons. OurMoonisquite
bigasfarasmoonsofplanets
inthesolarsystemgo.
HeresourEarth,withour
moontoscale.ButEarthis
...
Nextaregalaxies,eachacollectionofthousandsofmillionsofothersuns,whichwecallstars,heldtogetherbygravity
Therearehundred
sofbillionsof
galaxiesin...theUniverse
Whats bigger than what?...
...Asteroids,whichca
nbesmallorbiglum
psof
rockuptoafewtens
ofkmwide.Wefind
most
inoursolarsyste
mbetweenMarsand
Jupiter,
sprinkledinabelt. Onehitting
theEarth
probablykilledthed
inosaursoff.
Asteroidsaresmalle
rthan...
onlyoneof8otherplanetsgoingrounda
much,muchbiggerstar,whichwecallourSun.Sofar,thisistheSOLAR
SYSTEM...comets,asteroids,moons,
planetsand1star,theSUN.
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Life Cycle of Stars
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Are we alone?...
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How did it all get started?