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15 km further away every second and 1 Australia every 10 days implies that it would take 10 days to cross Australia if you were going at 15 km per second, which from my understanding of travel options there means either planes and trains are a lot faster than I was aware or something's got mixed up somewhere with these numbers!

> 15 km further away every second

Nope, not true. Not every second. Depends on the time of year. For a few months, each year, Voyagers actually get closer to Earth.

Check your math. It gets ~65 australias away each day.

Australia is wider than the moon so not a terrible unit

Hmm… moon circumference is 10Mm, Australia width is 4Mm, so you can lay 2½ Australias end-to-end when wrapping them around. Figuring out any 2D tessellation is left as an exercise for the reader. But the process of wrapping them… well, the biggest earthquakes on record only damaged half a dozen buildings and structures, to a few million dollars’ damage; this process might just cause rather a lot more. Like a zillion Australias divided by a Tahiti or so, that many times as much. Yeah. It’ll surely also depend on what depth you peel the Australias at.