Lesson 3: What Do You Know?

True or False


The lowest Earth-observing satellites take about 90 minutes to travel around the Earth.
Satellites cannot collect their Earth-observing data at night.
Satellites orbiting the earth thousands of times per year use almost no rocket fuel or propellant.
Clouds block all satellites from collecting Earth surface data.
NASA data images don't show any clouds because data was collected on a date and time when there was no cloud cover.
All satellites collect data by shooting a laser beam down and measuring the reflection that comes back.
Some satellites use invisible radiation to make Earth measurements.
Most satellites orbit far enough away from Earth so that each image made sees a whole hemisphere of the Earth.
9   Satellites that need to collect data over all the Earth usually fly over the Poles and not around the Equator.
10 Satellites that need to provide satellite TV services to a city usually fly over the Poles and not around the Equator.
11 Satellites typically use solar power rather than nuclear power to run the onboard electronics.
12 Most satellites use up their rocket fuel after 2 months and have to come back to Earth.
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Learn about satellites and their role in sensing El Niño in the Student Guide, Lesson 3 .