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Archive for June 9, 2015

Nearby “Dwarf” Galaxy Is Home To Luminous Star Cluster


The NGC 5253 galaxy as seen through the Hubble Space Telescope

The NGC 5253 galaxy as seen through the Hubble Space Telescope

A team of Tel Aviv University and UCLA astronomers have discovered a remarkable cluster of more than a million young stars are forming in a hot, dusty cloud of molecular gases in a tiny galaxy very near our own.

The star cluster is buried within a massive gas cloud dubbed “Cloud D” in the NGC 5253 dwarf galaxy, and, although it’s a billion times brighter than our sun, is barely visible, hidden by its own hot gases and dust. The star cluster contains more than 7,000 massive “O” stars: the most brilliant stars extant, each a million times more luminous than our sun.

“Cloud D is an incredibly efficient star and soot factory,” says Prof. Sara Beck of TAU’s Department of Astronomy and Astrophysics and co-author of the research, recently published in Nature. “This cloud has created a huge cluster of stars, and the stars have created an unprecedented amount of dust.”

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Sunset Jets On Rosetta’s Comet

June 9, 2015 1 comment

ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

When night falls on Rosetta’s comet 67P/Churyumov-Gerasimenko, the bizarrely shaped body remains active. This can be seen in new images of the Ma’at region located on the comet’s “head” captured by OSIRIS, the scientific imaging system on board the Rosetta spacecraft. They were taken approximately half an hour after the Sun had set over the region and show clearly distinguishable jets of dust escaping into space. Researchers from the OSIRIS team believe that the increasing heating-up of the comet is responsible for the newly observed phenomenon.

“Only recently have we begun to observe dust jets persisting even after sunset”, says OSIRIS Principal Investigator Holger Sierks from the Max Planck Institute for Solar System Research (MPS) in Germany. In the past months, the comet’s activity originated from illuminated areas on the day side. As soon as the Sun set, these jets subsided and did not re-awake until after the next sunrise. An exception poses an image from 12 March, 2015 showing the onset of a dust jet on the brink of dawn.

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The Moon Photobombs Uranus Live


uranus-11627_640_smObservers in eastern Australia, all of New Zealand, and parts of the South Pacific will see the planet Uranus pass behind the waning crescent Moon in the early morning of June 12, 2015. The precise timing of the event depends on your location. In Adelaide, Australia, Uranus passes behind the Moon at 18:49 UT, just after moonrise, and emerges from the dark part of the crescent Moon’s face at 19:57 UT. In Sydney the occultation begins at 19:01 UT and ends at 20:17 UT.

Observers in the rest of the world will see Uranus close to the crescent Moon in the eastern pre-dawn sky. This presents an excellent opportunity to spot this distant ice giant with a pair of binoculars or a small telescope. Slooh will be presenting live views of the event courtesy of our Australian feed partners. Join us to watch live views of the Solar System in motion!

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