[Steely Tom]

One of the main challenges NASA engineers face is the very low density of the Martian atmosphere. To be able to lift off in such a thin atmosphere, the blades of the Mars Helicopter have to spin much faster than here on Earth

Or be larger in blade area.

[rightwingcrazy]

Once they manage self-replication, using only resources available on the planet, then they’ll be onto something.

[cripplecreek]

Flying rovers are the way to go in my opinion.

[Beowulf9]

and in the Florida Keys.

[IronJack]

Mars’ thinner atmosphere should be somewhat offset by its lower gravity.

[bgill]

[oh8eleven]

... NASA says.
Did they say it in English or Arabic?

[Lazamataz]

Hell, microdrones will soon be swarming EARTH.

Each equipped with a single .22 round in a short barrel.

This will spell the end of the Age of the Gun, and tip the balance of power back to tyrants.

[ProtectOurFreedom]

Sheila Jackson Lee: “If you can do this on Mars, why not on the Moon?”

[arthurus]

Invasive species. They will take over the ecosystem.

[xp38]

Look sir! Drones!

[yefragetuwrabrumuy]

It’s a much better idea to use balloons with small solar powered fans to direct their general motion. Things would be much slower because of the thin atmosphere, but they would still cover vastly more distance than a ground rover.

http://mars.jpl.nasa.gov/technology/balloons/