On the Moon the first controlled powered flights were likely the Surveyor and Luna probes - they had braking and landing thrusters controlled by onboard avionics.

The moon is not a planet.

I'd argue Mars is still the most impressive. Rockets in no atmosphere is easy. Floating on Venus is easy because it has more atmo than any other rocky planet.

Figuring out something that works well in Mars' thin (but still there) atmosphere, especially a helicopter, is really impressive. The celestial body classification is just a cherry on top.

Highly recommend looking at the specs of the helicopter. It masses just 1.4kg. Each blade is 35g!

Basically a DJI Phantom 4.

Edit: Phantom 4 is 1.3 kg and blades are 45g

Except Ingenuity's blades are 4 feet long.

By many definitions the Earth-Moon system is a dual planetary system. The moon has more that 1% the mass of the Earth, which is by far the largest primary-secondary "not a planet" system in the solar system. Only not-a-planet Pluto and Charon exceed it.

Also, Isaac Asimov considered the system a dual-planet system as the Moon's path around the sun is at no point convex nor retrograde.

Earth-Moon centre of mass is inside Earth, so, it's obvious that the Moon is orbiting the Earth, not both orbiting something else.

1% is an arbitrary threshold and solar orbit is dependent on external circumstances rather than the Earth-Moon system itself.

  > Earth-Moon centre of mass is inside Earth, so, it's
  > obvious that the Moon is orbiting the Earth, not both
  > orbiting something else.

I used to agree with that school of thought, until I came up with a small thought experiment. Consider two bodies that are right on the planet-moon / dual-planet definition threshold. Intuitively, increasing the orbital distance between them would push them in the direction of which definition: planet-moon or dual-planet?

I'd tend to say that separating them further would tend more towards planet-moon. Yet doing so moves the system's center of mass outside the larger body, so would actually push the system into the dual-planet definition by that criterion.

The barycentre being inside of one of the things in the system is also an arbitrary threshold, isn't it?

The barycentre of the Sun and Jupiter isn't inside of the Sun.. so does that mean Jupiter doesn't orbit the Sun?

Technically the moon is a dwarf planet, as it has sufficient gravity to form itself into a spheroid shape, but it has not cleared its orbit.

It's Pluto all over again!

It's a fun exercise to work out the Gravitational Force between the Moon and the Earth and between the Moon and our Sun. It will surprise many that the Sun exerts more force on the Moon than the Earth does. So the Earth inflicts a strong perturbation on the motion of the Moon but it's not the dominant gravitational force on the Moon.

On Mars the Viking probes used rockets for controlled landing, so that likely also counts. Pathfinder just had one shot braking rockets.