And this year's winner of the Turner Prize is . .

https://www.legacysurvey.org//viewer/?ra=357.9559&dec=2.9732&layer=hsc-dr2&zoom=11

The whole ‘asteroid’ thing is not clear to me.
There are many objects that spark with very bright strong light with the green lines.
Are those all asteroids?

there are three colour filters used to generate the images, like the RGB channels on a video signal. If an object is present for the recording of one of the images but has moved away by the time the next colour layer is recorded, that image appears with one of the primary colours, either red, green or blue. The green ones are most noticeable as the eye is most sensitive to green, and there is nothing green in the night sky! If you look very carefully you will also start to see blue and red dots and streaks too. These artefacts are often edited out of the images by the processing software, but some do remain.
You will also sometimes see long, sometimes dashed streaks, which are the passage of a satellite during the exposure. I posted an image showing the tracks of a geostationary satellite earlier:

If you search for “geostationary” using the search icon at the top right, you will find a couple of other posts on these.

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Thanks so much

Also, very bright stars overload the digital sensors and create bright streaks. You will also see strange curved features here and there that are caused by the light from very bright stars reflecting off the telescope’s structures. Here is an example

These asteroids are much harder to spot, but here is an example of one captured in the blue layer of the image. This one is round, but they will often appear slightly elongated as they move across the sky during the exposure.

Screenshot 2021-08-02 at 09.42.24

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