Zusammenfassung der Ressource
Waves & the Universe
- P1.11 The Universe
- definitions
- solar system
- the Sun, the planets + their moons
- part of Milky Way galaxy
- galaxy
- collection of stars
- Universe
- made of of all the galaxies
- relative distances
- 1. moon=closest
- 2. Sun
- 3. planets
- 4. stars
- 5. other galaxies=furthest
- relative sizes
- 1. moon=smallest
- 2. Earth
- 3. planets
- 4. Sun&stars
- 5. galaxies
- 6. Universe=biggest
- P1.13 Exploring the Universe
- electromagnetic radiation telescopes
- show things visible light can't detect
- modern telescopes
- improved magnification
- see far away galaxies
- photography
- gather more data
- made with greater precision
- clearer images
- electromagnetic telescopes
- see objects that can't been seen using visible light
- telescope location
- in space
- microwaves
- infrared
- UV
- gamma
- Xrays
- some visible light
- dust, water vapour, pollution can distort image
- on earth
- visible light
- radio waves
- P1.14 Alien Life?
- signs of life
- liquid water
- oxygen
- from photosynthesising plants
- chemical changes
- e.g. methane
- methods
- space probes
- soil experiment by landers/rovers
- SETI
- Search for Extraterrestrial Intelligence
- P1.15 Life Cycles of Stars
- left hand path
- stars similar size to our Sun
- right hand path
- stars bigger than Sun
- massive stars
- gravity
- pulls a nebula together
- the hydrogen gets hot as GPE converted to thermal
- pulls collapsed red giant together
- forming white drwarf
- P1.16 Theories about the Universe
- steady state
- universe has always existed
- it is expanding
- new matter is being created
- big bang
- whole universe started as a tiny particle 13.5billion ys ago
- universe expanding from this+is still expanding
- evidence
- cosmic microwave background (CMB) radiation
- microwave radiation originally from big bang
- red shift
- object moving away has increased wavelength+decreased freq
- black lines 'shifted' to red end of spectrum
- P1.17 Red-Shift
- stars
- the more distant the star-greater the red shift
- sun is closer
- distant star
- theories
- proves universe is expanding
- supports both theories
- but BB is accepted due to CMB radiation