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What you will learn in Robotic Deep Space Probes

1. The first probes
Everything the early missions reached was inside the asteroid belt. Deep space begins where sunlight stops being enough to run on and an answer stops coming back while you wait.
2. Stealing speed from a planet
One flyby, watched from Jupiter and from the Sun. From Jupiter the spacecraft leaves exactly as fast as it arrived; from the Sun it has doubled its speed. Both are true, nothing was created, and Jupiter pays for it — with a slowdown of about 5 × 10⁻²¹ metres per second.
3. The Voyagers
Where the two of them actually are, how long an answer takes, and why crossing the heliopause is not the same thing as leaving the solar system. Plus the instrument ledger, which is a power budget written as a schedule.
4. Missions in flight
A timeline draws events, and 'still running' is not one — so the axis cannot tell you what is alive. What it can do is show you every planned mark carrying the date its plan was announced, which is a habit worth stealing.
5. How far is Voyager?
Nothing on the tracker is a stored distance. It holds a position, a date and a speed, and works out everything else while you watch — which is the only honest way to render a number that changes every second.

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1. The first probes
Everything the early missions reached was inside the asteroid belt. Deep space begins where sunlight stops being enough to run on and an answer stops coming back while you wait.
2. Stealing speed from a planet
One flyby, watched from Jupiter and from the Sun. From Jupiter the spacecraft leaves exactly as fast as it arrived; from the Sun it has doubled its speed. Both are true, nothing was created, and Jupiter pays for it — with a slowdown of about 5 × 10⁻²¹ metres per second.
3. The Voyagers
Where the two of them actually are, how long an answer takes, and why crossing the heliopause is not the same thing as leaving the solar system. Plus the instrument ledger, which is a power budget written as a schedule.
4. Missions in flight
A timeline draws events, and 'still running' is not one — so the axis cannot tell you what is alive. What it can do is show you every planned mark carrying the date its plan was announced, which is a habit worth stealing.
5. How far is Voyager?
Nothing on the tracker is a stored distance. It holds a position, a date and a speed, and works out everything else while you watch — which is the only honest way to render a number that changes every second.