6. images of Proxima Centauri taken
from Earth and the New Horizons
probe (April 2020)
Proxima Centauri is 4.24 light
New Horizons is currently over 6
billion km away
• Consider the diagram below. Write a simple equation that relates the
distance to a star with an observed parallax of p to our Sun in terms of
astronomical units (the distance between the Earth and Sun).
Remember your trigonometry!
• Imagine a group of astronomers established a colony on Mars.
Compared to scientists back on Earth, would they be more, less, or
equally successfully at estimating stellar distances? Briefly explain your