NanoSats/CubeSats

The term "nanosatellite" or "nanosat" is usually applied to the name of an artificial satellite with a wet mass between 1 and 10 kg (2.2–22 lb).

CubeSats

A CubeSat (U-class spacecraft) is a type of miniaturized satellite for space research that is made up of multiples of 10×10×10 cm cubic units. CubeSats have a mass of no more than 1.33 kilograms per unit, and often use commercial off-the-shelf (COTS) components for their electronics and structure.

First Interplanetary CubeSats to Mars

NASA's craft, known as MarCO-A and MarCO-B

The Mars Cube One Duo

Picture from Mars

MarCO B CubeSat image of Mars 26 Nov 2018