Stars And The Universe Continued
Gbogbo ọrọ náà
Our Sun is one star among hundreds of billions in the Milky Way, which is itself one galaxy among billions in the Universe. The light from those distant galaxies carries a startling message: stretched towards the red, it tells us the whole Universe is expanding.
In this lesson you will learn the scale of the Milky Way and the Universe, what redshift is and why it is evidence for an expanding Universe and the Big Bang, and how cosmic microwave background radiation supports the same theory. You will use the Hubble constant to estimate the age of the Universe.
Ebumnobi
- Know that the Milky Way is one of many billions of galaxies making up the Universe and that the diameter of the Milky Way is approximately 100 000 light-years
- Describe redshift as an increase in the observed wavelength of electromagnetic radiation emitted from receding stars and galaxies
- Know that the light emitted from distant galaxies appears redshifted in comparison with light emitted on the Earth
- Know that redshift in the light from distant galaxies is evidence that the Universe is expanding and supports the Big Bang Theory
- [Supplement] Know that microwave radiation of a specific frequency is observed at all points in space around us and is known as cosmic microwave background radiation (CMBR)
- [Supplement] Explain that the CMBR was produced shortly after the Universe was formed and that this radiation has been expanded into the microwave region of the electromagnetic spectrum as the Universe expanded
- [Supplement] Know that the speed v at which a galaxy is moving away from the Earth can be found from the change in wavelength of the galaxy’s starlight due to redshift
- [Supplement] Know that the distance d of a far galaxy can be determined using the brightness of a supernova in that galaxy
- [Supplement] Define the Hubble constant H₀ as the ratio of the speed at which the galaxy is moving away from the Earth to its distance from the Earth; recall and use the equation H₀ = v / d
- [Supplement] Know that the current estimate for H is 2.2 × 10-18 per second
- [Supplement] Know that the equation d / v = 1 / H₀ represents an estimate for the age of the Universe and that this is evidence for the idea that all the matter in the Universe was present at a single point
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Stars And The Universe Continued. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- The diameter of the Milky Way is approximately: A. 100 light-years B. 100 000 light-years C. 1 light-year D. 100 million km Answer: B
- Redshift in the light from a distant galaxy means its observed wavelength is: A. shorter B. longer C. unchanged D. zero Answer: B
- Redshift of distant galaxies is evidence that the Universe is: A. contracting B. expanding C. static D. rotating Answer: B
- Cosmic microwave background radiation is observed: A. only from one direction B. from all directions in space C. only from the Sun D. only from the Milky Way Answer: B
- The Hubble constant H0 is defined as: A. v x d B. v / d C. d / v D. d x t Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Stars And The Universe Continued? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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