行星及月球英文版

PlanetsandMoons
Overview
Thisonlinelessonsconsistsofthechapters
TheSolarSystem
ThePlanets
Moons
Planetsofotherstars
Moreinformation:Links
TheSolarSystem
WhatistheSolarSystem?
IntheUniver,theSolarSystemisourhomeland,andtheEarthisourhometown.
TheSolarSystem
TheSolarSystemconsistsof
thesuninitscentre
nineplanets,circlingaroundthesun
moons
asteroids
andcomets.
TheSolarSystem
HowdidtheSolarSystemevolve?
Scientistsarequitesure,thatinthebeginningofourSolarSystemtherewasahugediscofdirt,rocks,gas,iceetc.
Inthemiddleofthisdisc,theSunformeditlfandbegantoglow.
Insomedistancesfromthecentre,theplanetmergedfromtheringsofdirt,rocksandgas.
TheSolarSystem
HowlargeisourSolarSystem?
TheorbitonwhichPluto(thefarthestplanet)circlesthesun,hasanaveragediameterof5.910.000.000km(Pluto‘sorbitisrathernon-circular).
Thesunitlf,thelargestobjectinourSolarSystemhasadiameterof1.392.520km.
TheSolarSystem
HowcanIimaginethesizesanddistances?
ImaginetheSolarSystembeingasoccerground(about100mlong).
Thesunwouldbeaglaringorangeinthecentre.
Plutowouldencirclethesunattheedgeofthesoccerground,havingthesizeofadustparticle.
TheEarthwouldbe1,30mawayfromthe“orange“,havingthesizeofasameed.
TheSolarSystem
ThePlanets
MercuryistheplanetthatisclosttoourSun.Plutoisthefarthest.Remembertheorderoftheplanetslikethis:
MyVeryEducatedMotherJustShowedUsNinePlanets
whichmeans
MercuryVenusEarthMarsJupiterSaturnUranusNeptunPluto
Mercury
WhatareMercury‘sfeatures?
condsmallestplanet
nearesttothesun
oneMercury-yearisaquarterEarth-year
Mercuryisverydifficulttobespottedwiththenakedeye
Mercuryhasnomoons