astrophysics

Question 1

what soes gravity depend on

what is instantaneous velocity

Answer 1

mass, distance

how fast you need to go to remain in orbit

Question 2

different types of orbits

Answer 2

orbits of themoon and planets are eliptical

comets have very elliptical orbits with the sun at fouc

Question 3

orbital speed equation

Answer 3

2 x pi x orbital radius / time period

Question 4

stellar evolution

Answer 4

nebula, protostar, main sequence, either red giant (then white dwarf), or red superiant, supernova, neutron star or black hole

Question 5

surface temperature calculations

Answer 5

coldest to hottest red orange yellow white blue

Question 6

what is the doppler effect.

Answer 6

when a source of light is moving away from us the waves undergo a change in frequency from when they were emitted to when they are observes,

Question 7

red shift model answer

Answer 7

different elements absorb different frquenceies of light
when light is passed through a sample of an element a pattern of dark lines are produced
when we look at planets we see the same thing but at lower frequencies than they should be
the patterns have been shifted towards the red end.

Question 8

redshift universe

Answer 8

measurements of the redshift suggest that all galxies are moving away from us
mroe distant galaxies have gerater red shift than nearer ones
that means that distant galaxies are moving away faster than nearer ones

Question 9

what is a univers
galaxy
solar system

Answer 9

large collection of billions of galaxies
large collection of billions of stars
in the milky way

Question 10

gravity

Answer 10

non contact force
towards centre of an object
acts at a single point centre of mass

Question 11

cosmic microwave background radiation

Answer 11

shorter wavelength of gamma radiation emitted are believed to have become stretched until they have become microwaves