An aerobot is an aerial robot, usually used in the context of an unmanned space probe or unmanned aerial vehicle.
Vega balloon probe on display at the Udvar-Hazy Center of the Smithsonian Institution
Artist's conception for a Venus airplane
The Vega program was a series of Venus missions that also took advantage of the appearance of comet 1P/Halley in 1986. Vega 1 and Vega 2 were uncrewed spacecraft launched in a cooperative effort among the Soviet Union and Austria, Bulgaria, France, Hungary, the German Democratic Republic, Poland, Czechoslovakia, and the Federal Republic of Germany in December 1984. They had a two-part mission to investigate Venus and also flyby Halley's Comet.
Vega mission description
A Vega probe bus on display at the National Air and Space Museum
Artist's impression of the Vega probe on Venus
Vega balloon probe on display at the Udvar-Hazy Center of the Smithsonian Institution. Photo by Geoffrey A. Landis.