大学天文学课件第1章天文观测-辐射基本知识.pdfVIP

Howtostudyastronomy?

Directmethod:Collectsamples(meteorites,moonrocks,dust,

etc)andsenddetectorsorspacecrafts

Thisartist’srenderingshowstwoastronaut-scientists(oneanexobiologistandtheothera

geologist)exploringapromisingsedimentarydepositonMarsca.2035.Theyaresearching

forfossilsofancientlifeontheRedPlanet.1

2

•美计划造巨型飞船百

年内送人类出太阳系

重达5万吨，

由核聚变提供

动力，以12%

的光速行驶，

而旅行时间会

NeilAldenArmstrong1930.8.5-2012.8.25接近50年。

“个人一小步,人类一大步”

•美计划百年内造星际飞船宇

航员将有去无回

梅·杰米森

4

Butstarsandgalaxiesarefarbeyondourreach,howdowe

gettheinformationanddosomeresearchesofthem?

•Theclosestneighborofoursun,

CentauriinProximais4.3light-yearsaway

•AndromedaGalaxyliesabout2.5million

light-yearsaway

Thelawsof.

•ApplythephysicallawsgainedintheEarth’slaboratoryto

theremotelyastronomicalenvironment.

•Assumethatthebasicphysicallawsshouldbevalidat

anyplaceandatanytime.Wejustextrapolatethisideatothe

remoteobjectseventocosmologicalscale

5

6

：InformationCarriers

电磁辐射(elec