Tag: Lichen

Comet G3 (Atlas)

[This] image featured in NASA’s Astronomy Picture of the Day for 25th January 2025. Visit the website and have a browse around, there are so many fine images here!

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Image 131 – What’s in an image? Sometimes quite a lot, more than meets the eye. I’m posting an image every day or so.

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(NASA)

This might be the most striking photo you’ll ever see of a comet. OK, I dare say there will be better images out there, but this one is still pretty amazing.

The image featured in NASA’s Astronomy Picture of the Day for 25th January 2025. Visit the website and have a browse around, there are so many fine images here!

If you look closely (click the thumbnail and expand it as far as it will go) you’ll see plenty of stars in the image, too. Of course, they are way, way in the background far beyond the Solar System whereas the comet is right here inside the system along with the Sun, Planets, Moon, me and you.

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Lichens

Lichens are the main food source for a variety of animal species from small mites and insects to the remarkably large reindeer. They tend to be protein-poor but may be rich in carbohydrates.

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Image 130 – What’s in an image? Sometimes quite a lot, more than meets the eye. I’m posting an image every day or so.

Enlarge

Lichens are amazing. They’re always small, they grow in slowly expanding colonies, and they consist of cooperating fungi and algae. A number of different species of fungi can grow like this, combined with various yeasts and bacteria. The assemblage often looks like a simple plant, often almost flat, but sometimes filamentous, branching or in the form of flakes. Circular forms like the one in the image are common. The Wikipedia article listed below has photos of a range of different forms.

The grey colony in the photo has grown out from the centre ‘cleaning’ other life forms from the surface of the underlying limestone and spreading out further around the perimeter. The black lichen was destroyed as the grey lichen crossed over it, but new colonies of the black lichen have established on the clean rock left behind. The situation is dynamic, but very slow. Return for another photo a month later and little will have changed.

Lichens are the main food source for a variety of animal species from small mites and insects to the remarkably large reindeer. They tend to be protein-poor but may be rich in carbohydrates.

See also:

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Useful? Interesting?

If you enjoyed this or found it useful, please like, comment, and share below. My material is free to reuse (see conditions), but a coffee is always welcome!