Every day, satellites take pictures of Earth's surface. Images from space provide remarkable views of our home planet. These images are also important tools for researchers studying Earth's systems. From tracking the path of a hurricane to analyzing the health of a field of crops, satellites monitor both global and local change.
One type of change that can be observed
in satellite images is the growth of urban areas. Las
Vegas, Nevada is one of the fastest-growing cities in
the United States. The animation below shows a series
of satellite images that reveal the extent of urban
development in the Las Vegas area in 1964, 1972, 1986,
! Click the image to see the animation. Step through the images frame by frame to observe the changes occurring over time.