Steve:
I still think my camera is better. It has a big flash and I can take pictures in the dark. I am sure that satellites can not take pictures when it is dark.
I still think my camera is better. It has a big flash and I can take pictures in the dark. I am sure that satellites can not take pictures when it is dark.
Uncle Roger:
Some satellites need sunlight to take images. There are other satellites that work like your flash camera. Instead of a bright flash they send out a wave-like signal. The signal is known as a radar signal or a microwave signal. The signal hits the Earth's surface and goes back to the satellite. The satellite uses the radar signal to make an image. These satellites are known as SAR satellites. SAR stands for synthetic aperture radar.
Some satellites need sunlight to take images. There are other satellites that work like your flash camera. Instead of a bright flash they send out a wave-like signal. The signal is known as a radar signal or a microwave signal. The signal hits the Earth's surface and goes back to the satellite. The satellite uses the radar signal to make an image. These satellites are known as SAR satellites. SAR stands for synthetic aperture radar.
