The Dynamics of Visible Objects in the Universe

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Presentation transcript:

The Dynamics of Visible Objects in the Universe New Core Curriculum week 4, class-1 Foundations of Scientific Process The Dynamics of Visible Objects in the Universe

How do we measure distance of these objects ?

Distance Measure  a) Laser beam + mirrors Earth-Moon distance was determined

Stellar Parallax Distance to star = 4.4 ly D/d = angle (in radians) Distance Measure  b) Parallax Stellar Parallax D/d = angle (in radians) Text .7” d(istance) Distance to star = 4.4 ly D biased for “near-by” objects

How do we know the dynamics of these objects ?

Doppler effect Phenomenon exhibited by a moving source of light: Blue shift You might wish to review waves/wavelengths here as well. Red shift Which direction is the wave source moving?

Limitation: wavelength shifts are tiny Doppler Shift Method: Limitation: wavelength shifts are tiny

star wobbles in response to planet orbiting it Doppler Shift Method: example: star wobbles in response to planet orbiting it observer

Doppler Shift of light “- v”: TOWARD the observed wavelength stretched  object moving away the observer wavelength compacted  object is moving towards the observer 400 nm 800 nm Emitted Star Light (intrinsic) Red Shift Receding Observed Star Light (detected) “- v”: TOWARD the observed “+v”: AWAY from the observed

- what is an orbit!!!! Students don’t get this....

“Galaxy Crash” can be loaded from the following website: http://burro.cwru.edu/JavaLab/GalCrashWeb/main.html select option “applet” and then you can specify some parameters of the 2 galaxies whose interactions you would like to model

The Dynamics of Visible Objects in the Universe Key Concepts for Week-4, Class-1: (what You need to know, as You will be tested on this material): Term “Proxy” Proxy for distance (mirrors & laser light, parallax) Proxy for velocity (Doppler Shift Method) Doppler Shift Phenomenon / Method Blue shift (moving towards) & Red shift (moving away) Atomic line spectrum (atomic fingerprint) as an aid for applying Doppler Shift Method Value of Models in Astronomy