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Uncovering the origin of the universe Uncovering the origin of the universe

Uncovering the origin of the universe - PowerPoint Presentation

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Uploaded On 2020-06-29

Uncovering the origin of the universe - PPT Presentation

Older larger colder less energetic now Big Bang Prediction of Cosmic Microwave Background radiation λ emitted 1 μ m T emitted 3000 K R observed 1000 R emitted ID: 788606

observed background big cosmic background observed cosmic big universe radiation cmb microwave infrared uniform emitted 1000 spectrum

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Presentation Transcript

Slide1

Uncovering the origin of the universe

Older ….. larger … colder ….less energetic

now

Big Bang

Slide2

Slide3

Slide4

Prediction of Cosmic Microwave Background radiation

λemitted = 1 μ

mTemitted = 3000 K

Robserved = 1000Remitted

λobserved = ?

Tobserved = ?

Slide5

Comsat communication antenna

– calibrated 1965

see p88 – 89 of textbook

Slide6

Cosmic Microwave Background Radiation

Slide7

Slide8

The sky at different wavelengths

Visible

Near infrared

Far infrared

Slide9

Spectrum observed by Cosmic Background Explorer satellite (COBE)

Slide10

The Cosmic Microwave Background - key points

CMB is the principal piece of evidence for the Big BangTheory predicts that radiation of λ ≈ 1

μm filled the universe 300,000 years after the Big BangRadiation is observed, filling the universe, but λ has stretched to 1mm

λobserved = 10-3 = 1000 = 1+z

λemitted 10-6 so

z =1000 for the CMB – the ultimate red shift; the furthest back in time that we can seeRadiation is very nearly uniform – shows that it originated from a (nearly) uniform universeEvidence that CMB really is the ‘remains of the Big Bang’:

Comes from everywhere

Wavelength agrees with predictions

Has the expected ‘black body radiation’ spectrum