this post was submitted on 29 Mar 2026
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A baby leaves Seattle going east at 18km/s another baby leaves New York going west at 34km/s, how long before each baby clears the heliopause. Please show your workings out.
Child services:
There's a Ryan Gosling gif for everything lmao
I surely prefer him than DiCaprio
I know for a fact this isn’t right but it’s probably close enough to work. About 30-32 years for infant 1, and infant 2 doesn’t work with this approximation at all, but I’m so long out of physics classes that I don’t know how to calculate it properly. But it was fun to try!
My work:
The voyager crafts launched in 1977 and cleared the heliopause in 2012 and 2018. Your proposed infant 1 is going 1km/s faster than voyager 1 (17km/s) which cleared in 2012, and 3km/s faster than 2 (15km/s) which cleared in 2018.
Voyager 1 took 35 years, voyager 2 took 41 years, meaning that 2km/s different amounts to ~6 years, or 3 years per 1km/s
Subtract that 3 years from the time it took for voyager 1 because your infant is moving 1km/s faster, and you get about 32 yrs. Add in some wiggle room because it’s not exactly linear, and 30-32yrs.
This approximation totally broke down with infant 2 due to the scale of difference in speed, and had it getting there before it launched. If you take the same 3 yrs/1km/s, and multiply it by 16, which is the difference between the infants’ speeds, you get 48 years, which would put it there before it launched based on voyager 1 taking 35 yrs. 🤷🏻