Wind streaks in Planet Four: Ridges
Perusing Planet Four: Ridges Talk I came across the image below. I thought I’d say more about it in case you encounter similar types of images. What drew my eye was the large diffuse lighter streaker on the one side of the crater.
That’s called a wind streak. Wind streaks have been found not only on Mars but also on Venus and Earth. As their name implies, they are formed directly by the interactions of the surface wind with the soil. The wind is impacted by obstacles in its path on the surface like crater rims. As the wind moves around the crater rim either picks up dust particles pushing them together collecting them to create bright streaks visible from orbit or the wind excavates material exposing a darker material than the surrounding top surface layer. Wind streaks extend into into the direction the wind is moving towards, so they are also good indicators of past wind direction.
Ziggy Stardust and the Spiders from Mars – David Bowie was right!
Today we have a guest post by Planet Four volunteer Peter Jalowiczor.
Why Ziggy Stardust and the Spiders from Mars? As we know Ziggy Stardust is David Bowie’s alter ego, a rock star who acts as a messenger for extraterrestrial beings. Unfortunately, no extraterrestrial beings have been found on Mars (at the time of writing, at least!). But spiders have definitely been discovered…
From this then, as a Planet Four contributor for a number of years now, I recently put together a talk about the P4 Project to be given at my local Astronomical Society: the MSAS (Mexborough and Swinton Astronomical Society). The society is based about 20km from Sheffield (pop. 570,000), England and was founded in 1978. Every Thursday evening is a social occasion centered around a talk. Members, such as myself are encouraged to give talks on different subjects. Usually once a month, an academic visits the society to lecture on an aspect of Astronomy. In March this year the MSAS held a ‘Back to Basics Workshop’ in conjunction with the BAA (British Astronomical Association).
Back to the talk: my initial presentation was to be a preliminary discussion about Mars in general, before focusing on the results (images) from the HiRISE (High Resolution Imaging Science Experiment).
After letting Meg know of my P4 talk, I was very kindly sent lecture materials over from Hawaii. and on June 1st did my best to interpret and present one of Meg’s lectures: ‘Exploring Mars with 150,000 Earthlings’. This was Meg’s lecture at the ‘Imiloa Astronomy Center of Hawaii from February. It was an introduction to the Planet Four Project and collaboration with over 150,000 citizen scientist volunteers worldwide. Describing how, by the power of the internet, volunteers map the fans and other surface features formed by carbon dioxide jets helping planetary scientists characterize surface features on Mars. There was also a discussion of the other Mars projects: Terrains and Ridges and how people can get involved in exploring Mars from the comfort of their own home.
Photos from just before start of the lecture are included here. On an evening where I was competing against the British weather – but this time it was a very beautiful, warm sunny evening (something to be cherished in the UK) so the turnout wasn’t that bad. The society was very interested in the research carried out by the team and is grateful to Meg for the material.