1....NASA's Deep Space Network (DSN) is a collection of antennas at three sites around the globe used to communicate with interplanetary spacecraft missions
DSN also is used by radio and radar astronomers to observe the Solar System and the Universe.
2.....There are three deep-space such communications facilities placed approximately 120 degrees apart around the world:
- at Goldstone, in California's Mojave Desert
- near Madrid, Spain
- near Canberra, Australia
3.....
The antennas on Earth must be able to track at very precise rates — at thousandths of a degree per second — to remain pointed at the spacecraft as the Earth is rotating at 0.004 degrees per second
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