Succession of satellites keep eye on Earth
Excerpt from the January 22, 1966 issue of Science News Letter
![Mount Etna](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/01/012316_notebook_50ya.jpg?fit=860%2C460&ssl=1)
VIEW FROM ABOVE A plume of gas and ash spill from Mount Etna in this image captured December 3 by the Landsat 8 satellite. A fleet of Earth-monitoring satellites was proposed in 1966; Landsat 8, launched in 2013, is the youngest.
USGS/NASA Landsat