Tuesday, 16 October, 2018

Never Before Seen Binary Asteroid 288P

Never Before Seen Binary Asteroid 288P

Posted on Sunday, 24 September, 2017 by Zheluo Cai

Never Before Seen Binary Asteroid 288P.

Asteroids are primitive Solar System bodies that evolve both collisionally and through disruptions arising from rapid rotation^. These processes can lead to the formation of binary asteroids and to the release of dust, both directly and, in some cases, through uncovering frozen volatiles. In a subset of the asteroids called main-belt comets, the sublimation of excavated volatiles causes transient comet-like activity. Torques exerted by sublimation measurably influence the spin rates of active comets and might lead to the splitting of bilobate comet nuclei. The kilometre-sized main-belt asteroid 288P (300163) showed activity for several months around its perihelion 2011, suspected to be sustained by the sublimation of water ice and supported by rapid rotation, while at least one component rotates slowly with a period of 16 hours. The object 288P is part of a young family of at least 11 asteroids that formed from a precursor about 10 kilometres in diameter during a shattering collision 7.5 million years ago. 288P is a binary main-belt comet. It is different from the known asteroid binaries in its combination of wide separation, near-equal component size, high eccentricity and comet-like activity. The observations also provide strong support for sublimation as the driver of activity in 288P and show that sublimation torques may play an important part in binary orbit evolution. Credit: Published Paper A Binary Main-Belt Comet by Jessica Agarwal et al., in Nature 25 July 2017.

Read Article Here:

https://phys.org/news/2017-09-hubble-unique-solar.html

The Guna, known as Kuna prior to an orthographic reform in 2010, and historically as Cuna, are an indigenous people of Panama and Colombia. In the Kuna language, they call themselves Dule or Tule, meaning "people," and the name of the language in Kuna is Dulegaya, literally "people-mouth." Most Gunas live on small islands off the coast of the comarca of Kuna Yala known as the San Blas Islands. Each community has its own political organization, led by a saila, who is traditionally both the political and religious leader of the community; he memorizes songs which relate the sacred history of the people and transmits them to the people. Traditionally, Guna families are matrilinear, with the groom moving to become part of the bride's family and taking the last name of the bride as well.

M16: In and Around the Eagle Nebula.
Image Credit & Copyright: Andrew Klinger. A closer look at the Eagle Nebula shows the bright region is a window into the centre of a larger dark shell of dust. A brightly-lit workshop appears where a whole open cluster of stars is being formed in the midst of tall pillars and round globules of dark dust and cold molecular gas. Already visible are several young bright blue stars whose light and winds are burning away and pushing back the remaining filaments and walls of gas and dust. The Eagle emission nebula, tagged M16, lies about 6500 light years away, spans about 20 light-years, toward the constellation of the Serpent (Serpens). This picture involved over 25 hours of imaging and combines three specific emitted colours emitted by sulfur (coloured as red), hydrogen (yellow), and oxygen (blue).

The flag of Mozambique was adopted on May 1, 1983. It includes the image of an AK-47 with a bayonet attached to the barrel. It is one of three national flags among UN member states that features a firearm, along with those of Guatemala and Haiti. Green stands for the riches of the land, the white fimbriations signify peace, black represents the African continent, yellow symbolises the country's minerals, and red represents the struggle for independence. The rifle stands for defence and vigilance, the open book symbolises the importance of education, the hoe represents the country's agriculture, and the star symbolises Marxism and internationalism.

The Elgin Marbles are a collection of Classical Greek marble sculptures made under the supervision of Phidias and his assistants in c. 447 to 438 BC; originally part of the temple of the Parthenon. From 1801 to 1812, agents of Thomas Bruce, 7th Earl of Elgin removed about half of the surviving sculptures and transported them to Britain. The half not removed is now displayed in the Acropolis Museum. In Britain, the acquisition of the collection was not supported by some, and the Earl's actions was likened to vandalism. Following a public debate in Parliament and its subsequent exoneration of Elgin, he sold the Marbles to the British government in 1816. They were then passed to the British Museum, where they are now on display in the purpose-built Duveen Gallery.

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