With ionic motors? or chemical engines? liquid propellant (LH2) or gas? What is the most compact way to make the trip? in the smallest possible rocket, for example the SS-520-5 is a 2-stage rocket, 11.5m high and 50cm in diameter, that can launch loads of up to 1.3kg to LEO, a variant of that to launch 300 / 350kg and we could launch a probe propelled by ionic motors. what do you think?

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    $\begingroup$ What is an "etama"? $\endgroup$ – Organic Marble Mar 3 '20 at 23:40
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    $\begingroup$ Define “efficient”. $\endgroup$ – Russell Borogove Mar 4 '20 at 0:25
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    $\begingroup$ In other words, do you mean lowest cost, or shortest time, or minimum propellant mass, or... $\endgroup$ – uhoh Mar 4 '20 at 4:10
  • $\begingroup$ The way I have less mass and volume, the time while it is less than 10 years does not matter to me $\endgroup$ – Valentino Zaffrani Mar 4 '20 at 4:47
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    $\begingroup$ SS-520-5 is a three stage orbital rocket. It uses two stage sounding rocket SS-520 and third stage for orbit insertion. $\endgroup$ – WOW 6EQUJ5 Mar 4 '20 at 7:14