SPACE

Question 1

what is red shift?

Answer 1

red shift is the stretching of light wavelengths, which makes objects in space seem to be shifted towards the red end of the visible colour spectrum.

Question 2

Explain the lifecycle of stars?

Answer 2

All stars start out as a stellar nebula, which is a large cloud of dust and gas. over time the hydrogen in the stellar nebula is pulled together by gravity, spin faster and faster while heating up. This becomes a protostar .the Protostar reaches a temperature of 15 000 000 when nuclear fusion can occur. During this period the star contracts, glowing brightly, becoming stable. it is now a main sequence star, remaining this way for million to billion of years . depending on the stars mass, it will go

Question 3

why do stars following different pathways

Answer 3

because of their mass

Question 4

why is red shift evidence to the Big Bang Theory?

Answer 4

as it demonstrates the the universe is expanding, as most galaxies are being red shifted, meaning that is we rewided time the universe would of originated from a single point this being the big bang

Question 5

steady state vs. big bang theory?

Answer 5

STEADY STATE

• the universe has always existed and will always exist
• has no explanation for the CMB radiation
• red shift supports this theory
• objects such as stars and galaxies have a fixed position and do not move as the universe expands
• universe is expanding and creating new mass to keep at a constant density

BIG BANG THEORY

• universe is around 14 billion years old
• red shift supports this
• CMB radiation is the ‘echo’ of residue from the big bang
• the universe is expanding, and objects further away are moving at a faster rate
• the universe may keep expanding and cooling, or it may stop expanding into a big ‘crunch’

Question 6

what is blue shift?

Answer 6

blue shift occurs when the wavelength of the light source is shortened, moving towards the viewer. this happens usually in the same galaxy.