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Chinese rover powers up devices in pioneering moon mission

phys.org

21–25 of 25 posts

Re: Chinese rover powers up devices in pioneering moon mission

#22

Just to be clear here because all the press releases are intentionally ambiguous about it: the only serious radio astronomy instruments are the Netherlands-China Low Frequency Explorer (NCLE) package on the relay sat in the L2 halo orbit always in line of sight of Earth. Not the lander, not the rover. The relay sat there is the step towards lunar far side radio astronomy but so far that is not actually going on. It's…

The article says:

"Harvard University astronomer Avi Loeb noted, however, that the relay satellite needed to send back information from the far side also contaminates the sky."

Does that mean the international community needs to agree a protocol to establish periods of radio silence for objects on the far side of the moon, and for lunar orbiting satellites, so as not to interfere with future radio astronomy instruments?

Re: Chinese rover powers up devices in pioneering moon mission

#23

Just to be clear here because all the press releases are intentionally ambiguous about it: the only serious radio astronomy instruments are the Netherlands-China Low Frequency Explorer (NCLE) package on the relay sat in the L2 halo orbit always in line of sight of Earth. Not the lander, not the rover. The relay sat there is the step towards lunar far side radio astronomy but so far that is not actually going on. It's…

The article says: "Harvard University astronomer Avi Loeb noted, however, that the relay satellite needed to send back information from the far side also contaminates the sky." Does that mean the international community needs to agree a protocol to establish periods of radio silence for objects on the far side of the moon, and for lunar orbiting satellites, so as not to interfere with future radio astronomy instrumen…

I don't think it is that serious yet but hopefully in time we will need to create ITU region 4, https://en.wikipedia.org/wiki/ITU_Region . The link back to Earth is relatively narrow beam width and it's doubtful a simple dish/feed setup has significant sidebands and even then at only a couple frequencies (probably ~7-8 GHz and ~2 GHz).

Re: Chinese rover powers up devices in pioneering moon mission

#24

The lunar surface is more brown in these photos than the ones from Apollo, which is more accurate?

Your comment reminds me of comments made about the colour of Mars. Allegedly it wasn't red enough and looked too much like Arizona so - allegedly - they made it to the expected red colour and kept this up over a series of missions. This does not answer your question, however, 'white balance' is a thing when it comes to space.

That's funny, but this is a little different since I'm comparing it to the Apollo mission photos.

The last thing I expected to see was a brownish lunar surface, considering one of the most notable things about the Apollo photos is their B&W appearance except for the lunar lander and american flag colors.

https://www.flickr.com/photos/projectapolloarchive/210374815...

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