Big Bang Theory + Evidence For It Flashcards
(11 cards)
1
Q
How comparing speeds of galaxies provide evidence for Big Bang Theory (5)
A
- further galaxies show greater red-shift
- further galaxies travel faster
- (this suggests) universe is expanding
- (showing that) at an earlier point in time…
- universe was a single point
2
Q
How CMBR is evidence for Big Bang Theory (4)
A
- CMBR is everywhere
- this implies all parts of the universe were in contact a long time ago
- wavelength has increased (as universe has expanded)
- universe was significantly hotter long ago
3
Q
How red-shift of galaxies supports Big Bang theory (6)
A
- further galaxy is from earth, greater the red-shift
- greater the red-shift, faster the galaxy is moving away
- speed of galaxies increases with increased distance
- speed and distance are directly proportional
- relationship between speed and distance implies expansion (galaxies moving apart from each other)
- expansion implies there was a single point in the past
4
Q
Define red-shift
A
- increase in wavelength (of wave)
- due to galaxy moving away from observer
5
Q
How does Hubble’s investigation provides evidence for the expansion of universe
A
- change in wavelength increases with distance (from earth or Milky Way)
- velocity increases with distance (from earth of Milky Way)
- galaxies are all moving away from each other
6
Q
Evolution of universe since big bang
A
- universe began as a hot, dense point (single point)
- expanded since big bang
- cooled since big bang
7
Q
How has size and temperature of universe changed since big bang
A
- universe is expanding / getting larger
- universe is cooling
8
Q
If asked where redshift of a star or galaxy is greatest, answer is the point where the star / galaxy has moved directly away from earth
A
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9
Q
When is maximum redshift observed
A
- while the entity moves directly away from earth
10
Q
Galaxies are all moving away from each other
A
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11
Q
Velocity of galaxies increases with distance from earth
A
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