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How to send information from the far side of the Moon to the Earth?

Astronomy Asked by nightcod3r on December 20, 2020

Chang-E has just sent a shot after landing on the far side of the moon. It looks tricky, how can a device send information from a place that is oriented opposed to Earth?

One Answer

You need a satellite that has a view of the landing site and the Earth. There are several possibilities for doing this. According to the NASA Space Science Data Coordinated Archive, the communications are relayed through the satellite Queqiao which is in a halo orbit around the Earth-Moon L2 point.

You could also have a satellite in lunar orbit, transmit data from the lander while it's over the far side, transmit data to Earth while it's over the near side.

Or relay via a satellite in interplanetary space, etc.

Correct answer by antispinwards on December 20, 2020

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