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Teaser 1458223732

Sharp pictures of planetary embryo show ultra-quick mode of planet formation

March 17, 2016
Observations using the VLA radio telescope array in New Mexico show the innermost portion of a planetary birthplace around the young star HL Tauri in unprecedented detail. Clearly visible is a lump of dust with 3 to 8 times the mass of the Earth, which represents the ideal conditions for the formation of a planet: a planetary nursery with sufficient building material for a planet somewhere between the mass of our own Earth and that of Neptune. The presence of a lump points towards a solution for a fundamental problem of planet formation: how planets can form on the limited time scale available for such processes. [more]
Teaser 1456758367

Searching for the extraterrestrials who might have found us first

March 01, 2016
A small band in the sky has been identified in which extraterrestrial astronomers could have discovered Earth transiting the Sun. The search for their messages can now be made much more efficient. [more]
Teaser 1454713378

Witnessing the wild phase of star formation

February 05, 2016
Have you ever seen a stellar embryo? A research team that includes an MPIA astronomer has inspected the birth places of stars: the FU Orionis objects, a class of very young stellar objects. These protostars are surrounded by large asymmetrical disks, indicating a short, violent episode during the early formation of the star. By employing the 8m Subaru Telescope on the summit of Mauna Kea on Hawaii, four of those disks have now been imaged with extreme resolution, thereby allowing the astronomers to identify their structure. The results are being published in the journal 'Science Advances'. [more]
Teaser 1454491067

Ultracool disk around young star contains dusty surprises

February 03, 2016
While the circumstellar disk in question has been nicknamed "the Flying Saucer," what is most mysterious about it are not extraterrestrials, but tiny particles of cosmic dust. An unusual new measurement of the disk's dust temperature using the ALMA observatory has yielded surprisingly low values, a mere 7 degrees above absolute zero (7 K). The astronomers, including Dmitry Semenov of the Max Planck Institute for Astronomy, found that the only viable explanations involve unusual properties of the disk's dust grains. With these unusual properties, dust disks could be quite generally more massive than previously thought, with consequences for the types of planets that can be born in such disks. [more]
Teaser 1452713358

Light and Darkness after the Big Bang: Compact galaxies reheated the early universe

January 13, 2016
What brought the dark ages directly following the Big Bang to an end? So-called "green pea" galaxies, which produce intensive UV radiation, are considered a possible explanation. Now researchers have examined a green pea in detail and found that it indeed emits sufficient radiation to explain cosmic reionization: The transition when most of the intergalactic hydrogen in the universe became separated into protons and electrons, starting 150 million years after the Big Bang. The result contributes to our knowledge about one of the least-known epochs of the universe, and has been published in the January 14 edition of the journal Nature. [more]
 
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