As much as we know today about the planets of the solar system, it’s almost incomprehensible that a mere 50 years ago we knew almost nothing about them. Observations of even Mars and Venus, Earth’s closest planetary neighbors, through Earth-based telescopes had provided only the most rudimentary information on their physical characteristics and essentially no information on the chemical properties of the planets and their atmospheres.
Air and Space
![Mariner 6 and 7 spacecraft](/sites/default/files/styles/landmark_node_/public/2018-03/Mariner_6-7.png?itok=2_h_jWHo)
YearAdded:
Image Caption: Mariner 6 and 7
2017
Innovations
![Mariner 6 and 7 spacecraft](/sites/default/files/styles/thumbnail/public/2018-03/Mariner_6-7.png?itok=dLJnZntt)
As much as we know today about the planets of the solar system, it’s almost incomprehensible that a mere 50 years ago we knew almost nothing about them. Observations of even Mars and Venus, Earth’s closest planetary neighbors, through Earth-based telescopes had provided only the most rudimentary…
Read More