29 junho 2017

NGC 7814: The Little Sombrero in Pegasus

Point your telescope toward the high flying constellation Pegasus and you can find this expanse of Milky Way stars and distant galaxies. Dominated by NGC 7814, the pretty field of view would almost be covered by a full moon. NGC 7814 is sometimes called the Little Sombrero for its resemblance to the brighter more famous M104, the Sombrero Galaxy. Both Sombrero and Little Sombrero are spiral galaxies seen edge-on, and both have extensive halos and central bulges cut by a thin disk with thinner dust lanes in silhouette. In fact, NGC 7814 is some 40 million light-years away and an estimated 60,000 light-years across. That actually makes the Little Sombrero about the same physical size as its better known namesake, appearing smaller and fainter only because it is farther away. Very faint dwarf galaxies, potentially a satellites of NGC 7814, have been discovered in deep exposures of Little Sombrero.

from NASA http://ift.tt/2tn1Cun
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As the first country to ratify the United Nations charter, Nicaragua was the first country to join...

As the first country to ratify the United Nations charter, Nicaragua was the first country to join the U.N.

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Objeto misterioso visto na superfície de Marte

Uma fotografia tirada pelo rover Opportunity mostra um objeto não identificado na superfície do planeta.

A imagem, que foi publicada pelo rover de 13 anos, em 17 de março, gerou buzz online com usuários da internet discutindo o que o objeto anômalo poderia ser.

Ao contrário das imagens anteriores de objetos anômalos em Marte, este é muito claro e, evidentemente, não é simplesmente um caso de pareidolia – a tendência natural do cérebro de ver formas significativas em padrões abstratos.

Situado na região ‘Meridiani Planum’ de Marte, a explicação mais provável é que é que seja fragmento de detritos dos próprios sistemas de pouso do rover.

De acordo com os usuários do Reddit, a Opportunity foi de fato conhecido por tirar fotos de seus próprios detritos naquela época.

Entretanto, a Nasa não emitiu qualquer explicação para a imagem.

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Who Invented The Toothbrush?

The first toothbrushes, as we would recognize them today with a handle and attached bristles, was invented in China during the Tang Dynasty. Bone or bamboo was used for the handle. Hog’s hair was used for the bristles. Specifically, imported hog’s hair from northern China or Siberia was used, because the colder temperatures made the hog’s hair firmer.

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Starry Night and Aurora

Expedition 52 Flight Engineer Jack Fischer of NASA photographed the glowing nighttime lights of an aurora from his vantage point in the International Space Station's cupola module on June 19, 2017. Part of the station's solar array is also visible.

from NASA http://ift.tt/2s5Udf4
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Great Blue Heron

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