4 ms·
Why would you put antennas behind the moon? I read the article: these antennas are radio telescopes (or perhaps just do the same job). So they're using the moo
by emirp 7y ago
Why would you put antennas behind the moon?
I read the article: these antennas are radio telescopes (or perhaps just do the same job). So they're using the moon to block interfering radio signals from Earth.
- emirp 7y agoThanks for the downvote. I thought I was contributing.
- draw_down 7y agoCome on
- basementcat 7y agoThey're listening to a doppler shifted version of the hydrogen alpha spectral line (~450 THz doppler shifted down to ~30 MHz) down to about the VHF television band (hence the almost "rabbit ears" style antennas). Being on the other side of the Moon shields them from powerful terrestrial transmitters. The massive doppler shift means they're listening (observing) to bubbling atoms of hydrogen closer in time to the Big Bang than what was observed by COBE or WMAP. https://lambda.gsfc.nasa.gov/product/cobe https://lambda.gsfc.nasa.gov/product/cobe https://map.gsfc.nasa.gov https://map.gsfc.nasa.gov
- twic 7y ago> We have the opportunity to perform our observations during the fourteen-day-long night behind the moon, which is much longer than was originally the idea. And from the sun. > The moon night is ours, now. That probably sounds less creepy in Dutch.