4.8 Space physics (Phys only)

Practice questions on Space physics (Phys only)

• Explain why the red-shift observed from a galaxy that is twice as far away as another gala… (4 marks, Explain)
• A scientist observes that a galaxy 500 million light-years away shows a greater red-shift … (4 marks, Explain)
• Describe what scientists observe when they analyse light from distant galaxies, and explai… (4 marks, Describe)
• Compare the uses of a low Earth orbit (LEO) satellite with a geostationary satellite, expl… (4 marks, Compare)
• Explain why a geostationary satellite always remains above the same point on the Earth's s… (4 marks, Explain)
• Explain why planets closer to the Sun orbit at greater orbital speeds than planets further… (4 marks, Explain)
• Describe how the gravitational force acting on a planet determines its orbital motion arou… (4 marks, Describe and Explain)
• Explain how observations of red-shift in light from distant galaxies support the Big Bang … (4 marks, Explain)
• Explain why a satellite in a circular orbit around the Earth does not need a continuous th… (4 marks, Explain)
• A student says: 'Red-shift proves that all galaxies are moving away from us, which means t… (4 marks, Evaluate)