From the article:
Balloons have long been utilized as a low-cost way to observe the cosmos and are routinely employed in observations of the Earth’s atmosphere. According to a recent review by a NASA scientist, the future of planetary exploration could lie in balloons that contain innovative steering devices and robot probes.
Read the full article here: GAC-Beyond-2000.pdf (1123 downloads)
MORE ABOUT PLANETARY BALLOONS
Read more about Planetary Balloons here