1 - WORLD - JoanMira

2014-10-12

Imagens do Mundo - Maranhao - Brasil

El pueblo indígena de los ka'apor, uno de los más amenazados por los madereros ilegales en Brasil, vive en una zona de la selva tropical demarcada en el estado de Maranhão, al norte del país. EL MUNDO se adentra en una de sus aldeas para conocer su cultura y la amenaza que los acecha.

En la imagen, el niño Araui Ka'apor sentado en una de los caminos que llevan hasta las tierras de su pueblo.

Astronomy picture of the day 12-12-2014 - The Helix Nebula from Blanco and Hubble

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The Helix Nebula from Blanco and Hubble
Image Credit: C. R. O'Dell, (Vanderbilt) et al.ESA, NOAO,NASA

Explanation: How did a star create the Helix nebula? The shapes of planetary nebula like the Helix are important because they likely hold clues to how stars like the Sun end their lives. Observations by the orbiting Hubble Space Telescope and the 4-meter Blanco Telescope in Chile, however, have shown the Helix is not really a simple helix. Rather, it incorporates two nearly perpendicular disks as well as arcs, shocks, and even features not well understood. Even so, many strikingly geometric symmetries remain. How a single Sun-like star created such beautiful yet geometric complexity is a topic of research. The Helix Nebula is the nearest planetary nebula to Earth, lies only about 700 light years away toward the constellation of Aquarius, and spans about 3 light-years.