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Maragos Kicks Off Women's History Month with Art and Photography...

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Maragos Kicks Off Women’s History Month with Art and Photography… Comptroller George Maragos is proud to announce the first Nassau County “Women of the World” – Art and Photography Exhibition to promote local female artists and contribute to the growing arts industry in the Cou…

Read more at http://www.j-s-w.co.uk/maragos-kicks-off-womens-history-month-with-art-and-photography/

O Γαλαξίας πάνω από τον Ναό του Ποσειδώνα σε ένα βίντεο!






Ένα εκπληκτικό timelapse βίντεο βασισμένο στην Αστεροφωτογραφία της NASA (τραβήχτηκε τον Ιούνιο του 2015) που παρουσιάζει τον Γαλαξία πάνω από το Ναό του Ποσειδώνα στο Σούνιο δημιούργησε ο Αλέξανδρος Μαραγκός, αποτυπώνοντας με ακρίβεια την ομορφιά του αττικού νυχτερινού ουρανού.

Αστέρια, αστερισμοί και λαμπερές αντανακλάσεις τον ουρανό συνθέτουν μια εικόνα μαγευτική που την βλέπεις και ξεχνιέσαι…






Timelapse: The Milky Way over the Temple of Poseidon (excerpt) from Alexandros Maragos on Vimeo.
Timelapse version of June’s 8, Astronomy Picture of the Day (APOD – NASA): http://ift.tt/1QgKFYt
The Milky Way rises over the Temple of Poseidon, at Cape Sounio,
65km southeast of Athens, Greece, at the southernmost tip of the Attica peninsula.
Music is Hammock – “Awakened, He Heard Only Silence”
and used with permission from Hammock Management.
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Πηγή

περισσότερα στο attikanea.blogspot.gr

The Milky Way over the Castle of Methoni, Greece by Alexandros Maragos
Via Flickr:
The Milky Way rises over the Castle of Methoni, in Messinia, Greece, at the southernmost point of the west coast of Peloponnese, in a place which had been fortified since the 7th century BC. Until 1204 AD it was used as a fort by the Byzantines, while in 1209 AD the Venetians became the rulers of the area. © alexandrosmaragos.com | facebook | twitter

Introducing the Coral Biome

Maragos, Jim. Coral Reef at Palmyra. Digital image. Wikimedia Commons. N.p., 27 Mar. 2011. Web. 1 Aug. 2015. <https://commons.wikimedia.org/wiki/File%3ACoral_reef_at_palmyra.jpg>.

What is a coral reef?

A coral reef is an oceanic ecosystem founded on the the calcium carbonate skeletons of Cnidarian hard coral (hexacorals). While the coral polyps which form the limestone structures of a reef are biotic contributors to the rich coral reef ecosystem, their skeletons are important abiotic factors. The stone skeletons provide shelter and a base for many other organisms. The structure of a coral reef is also molded by many other organisms such as soft coral (octocoral),sponges and algae which may also form as shelter for fishes and other nektonic swimmers. Once organisms die, their remains can become foundations for the next generation of coral polyps. Due to the abundance of shelter and availability of food which allow a myriad of organisms ranging from fishes to sponges to squids, coral reefs are generally considered one of the most biodiverse biomes in the world.

What are a coral reef’s limiting factors?

The well being of a coral reef is largely founded on the coral polyps which form it, as well as provide a food source for many organisms, therefore many of the limiting factors are correlated with the polyps. 

Coral polyps need sunlight because a major source of energy for them is their mutualistic symbiosis with phytoplankton called zooxanthellae, which photosynthesize nutrients in exchange for protection by dwelling inside coral polyps. In order to receive enough sunlight, clear water is necessary. Therefore, coral reefs are largely limited by the amount of sunlight they receive and water clarity. Pollution, sediment caused turbidity, and algal or planktonic overgrowth (caused by over abundant nutrients from runoff or other anthropogenic reasons) can all stunt the growth and sustainability of a reef.