#P6.5.1
recall the main features of our solar system, including the similarities and distinctions between the planets, their moons, and artificial satellites
#P6.5.2
explain, for the circular orbits, how the force of gravity can lead to changing velocity of a planet but unchanged speed
#P6.5.3
explain how, for a stable orbit, the radius must change if this speed changes
qualitative only
#P6.5.4
recall that the solar system was formed from dust and gas drawn together by gravity
#P6.5.5
use the particle model of matter to explain how doing work on a gas can increase its temperature (e.g. bicycle pump, in stars)
#P6.5.6
explain how the Sun was formed when collapsing cloud of dust and gas resulted in fusion reactions, leading to an equilibrium between gravitational collapse and expansion due to the fusion energy
#P6.5.7
explain the red-shift of light from galaxies which are receding
qualitative only
#P6.5.8
explain that the relationship between the distance of each galaxy and its speed is evidence of an expanding universe model
#P6.5.9
explain how the evidence of an expanding universe leads to the ‘Big Bang’ model