Here's a link about a new tech that is intented to be use by space probes and exo-planetary craft in order to explore inside different atmospheric pressure.
Of course they do want to use such technology to power aircraft here on earth, but the plasma based technology blocks radio communication (as well as jamming radar).
http://www.livescience.com/technology/080612-plasma-saucer.html
So in theory, it could be possible to make a craft that is capable to exit Earth atmosphere by his own, fly into space and fly over Mars surface to return back home on its own...
Of course they do want to use such technology to power aircraft here on earth, but the plasma based technology blocks radio communication (as well as jamming radar).
http://www.livescience.com/technology/080612-plasma-saucer.html
So in theory, it could be possible to make a craft that is capable to exit Earth atmosphere by his own, fly into space and fly over Mars surface to return back home on its own...