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Russell County Schools Non-Traditional Instructional Expectations
NTI Day #3
School RCHS Course/Subject Science I Teacher Ackerman, Branscum, Holmes
Learning Target:Studentswillreadpassageandanalyzespectraldatatodeterminethespeedanddirectionofa
nearbygalaxy.StudentswillrespondtodiscussionquestionsaboutHubble’sLaw
Lesson Directions:
Studentswillreadthepassageinthe“HowFarandHowFast”handout.
Thenstudentswillanalyzethespectralanalysisofamotionlessobjectandcomparethistothe
followingspectrums.TheywillapplyHubble’sLawtodetermineiftheobjectismovingcloseror
fartheraway.
Thenthestudentwillanalyzethespeedtheobjectistravelingandrankthemfromslowestto
fastestbasedontheinformationinthespectrum.
Technology-based Alternate Assignment Options: _______________________________________________
Watch the following YouTube video and write a half-page to whole page summary about the video:
https://www.youtube.com/watch?v=KhhaED90PoE_________________________________________________
_______________________________________________
Supplemental Resources and Support: __________________________________________________________
________________________________________________________________________________________________
To Contact School/Teacher for Support:
School Phone (9:00 AM-3:00 PM): 270-866-3341
Teacher Email (12:00-6:00 PM):
[email protected]
[email protected]
[email protected]
*Students will be contacted by a teacher on each NTI Day using the phone number provided on the
Student Data Sheet. Please ensure that any changes in phone numbers are reported to the school
throughout the year.
Reminder: Remember that these assignments are due back to the teacher within 2 school days.
Stars,Galaxies,andtheHowFarandHowFast?
Youknowthatelectromagneticradiationisenergyintheformofwaves.Planets,stars,andgalaxiesemit
electromagneticradiation.Asoneoftheseobjectsmovesthroughspacetowardanobserver,thewavesof
electromagneticradiationbetweentheobjectandtheobservermoveclosertogether.Thatis,thedistancebetweenthe
crestsofthewavesdecreases,causingthewavelengthtoshorten.Ifthatsameobjectmovedawayfromanobserver,
thewavesbetweentheobjectandtheobserverwouldmovefartherapartfromeachother.Thedistancebetweenthe
crestsofthewaveswouldincrease,andthewavelengthwouldlengthen.WhenastarismovingtowardEarthveryfast,
thewavelengthofitslightshortens,causingittoappearslightlymorebluethanusual.Ifastarismovingawayfrom
Earthveryfast,thewavelengthofitslightlengthens,causingittoappearslightlymorered.Bymeasuringthisblueshift
orredshiftoflight,astronomerscandeterminewhetherthestarismovingtowardorawayfromEarth,andhowfast.To
dothis,astronomersusetheshiftofspectrallinesproducedbychemicalsinthestar’satmosphere.Astronomerscan
alsousethespectrumofagalaxytotellhowfastthegalaxyismovingtowardorawayfromEarth.Usingtheprincipleof
redshift,EdwinHubblestudiedtherelationshipbetweenagalaxy’sdistanceandthespeedatwhichitmovesawayfrom
Earth.Hefoundthatthefartherawayagalaxyis,thefasteritmovesawayfromEarth.Thisrelationshipiscalled
Hubble’sLaw.Basedonthespectrumsinthefigure,rankthefourgalaxiesinorderofthespeedwithwhichtheyare
movingawayfromEarth,fromslowest(1)tofastest(4).
GalaxyA
GalaxyB
GalaxyC
GalaxyD
Rank(1=slowestand4=fastest)
RespondtoQuestions
1.BasedonHubble’sLaw,whichofthegalaxiesisfarthestfromEarth?
2.AreanyofthegalaxiesmovingtowardEarth?Explain.