I just looked up Voyager 1's current position for a talk and saw something wild: https://voyager.jpl.nasa.gov/mission/status/

The distance between Earth and Voyager 1 is actually *decreasing* right now (even though the distance between Voyager 1 and the Sun is increasing). A website bug?

Nope! Earth moves really fast around the Sun. Right now we're moving faster toward Voyager 1 than it's flying away from us

Earth orbits at 30 km/s around the Sun, Voyager is going "only" 17 km/s. I love orbital dynamics!

Voyager - Mission Status

@sundogplanets that's fascinating, and brings up so many more questions for me! 😂

How did we choose the direction to send Voyager off in? How far out of the plane of earths orbit around the sun is it?

I take it that the plane of earths orbit around the sun is stable relative to the rest of universe, on human timescales at least, or where constellations are in the sky would change year over year? Why? Are other planetary orbits similarly stable?

The 🌌, so interesting!

@esnyder They had pretty tight launch constraints to try to visit all the planets on the way out of the solar system. Earth's motion is super fast, but stars are really far away so they don't change positions noticeably (by eye) on human timescales
@sundogplanets Soon we will catch up with it! (just kidding.. I know better, but...)
@sundogplanets
That’s a very pleasing nugget. 😄

@sundogplanets Thanks for making me trip on this.

What if Voyager had been launched in March instead of September. Would it move faster?

@Supertapani They had pretty tight launch constraints to try to visit all the planets on the way out of the Solar System. And if it launched in a different season, we'd still have this effect, just at a different time of year.

@sundogplanets I forgot everything about probe trajectories, as I pictured you on your asteroid with your goats.

You must hear this a lot 😆

@sundogplanets I love this! Particularly because I’m from #Canberra in #ngunnawalCountry and #ngambriCountry but living in #london. So #voyager’s radio goes to @canberradsn and is even further from home than me!
@sundogplanets I will be sure to wave. At about what date will it be the closest?

@sundogplanets

And in 6 months it will be reversed.

@sundogplanets Wait. You've just reminded me that when you stand completely still you're actually still whirling around the sun at 108,000 km/h and it gets even crazier when you factor in the speed of the sun (which is itself racing through space) and so on. No wonder everyone's stressed all the time.
@sundogplanets on earth, the sound of the train whistle on Voyager is increasing in pitch!
@sundogplanets Just like cars on the highway.
@sundogplanets So that means that there is am oscillation if you plot distance between Voyager 1 and Earth versus time - pretty cool!
@sundogplanets last night I learned that from the 1970s through the 90s, every drawing of the solar system was wrong, because between those decades, Pluto was closer to the sun than Neptune

@sundogplanets

One day we will manage to get crewed missions flying at good enough speed.

And then one of nice missions would be sending a team to Voyagers. Repair them, fuel up and let them continue the journey. Maybe add some companion to handle communication a bit better.

Of course the problem would be to find them first ;D

@sundogplanets If you want to look at something very cool, assume earth is your still point (immobile, etc) and then look at the orbital paths of every thing orbiting earth, and voyager's orbital path.

It's not particularly 'useful' to look at the solar system that way, but it is interesting (and gives cool orbital mechanic velocities that help you get an intuitive grasp of launch windows from earth!).

Also I love that we can just 'decide' that everything orbits earth, and be Right*.

@sundogplanets this might be the one single paragraph where the word "only" will ever be an acceptable prefix to "17 km/s" 😶
@sundogplanets NASA's page give distance and speed in mi and mph 😂