Use this IGCSE Physics objective to explain that D/v = 1/H0 estimates the age of the universe, supported by examined questions and mark schemes.
A galaxy is approximately 1.2×1026 m from the Earth.
Scientists have measured the speeds at which distant galaxies are moving away from the Earth and their distances from the Earth.
These measurements suggest that all the Universe was once at a single point.
Explain why.
any two from:
- more distant galaxies are moving away faster
- universe is expanding
- (if galaxies are moving away from each other now, then) in the past galaxies were closer together