GIANT PLANETS IN PROTOPLANETARY DISKS WITH SPIRAL ARMS?

There are many theories about the formation of the planets but the direct observational evidences are quite a few. Recently, the ground-based telescopes photographed two large spiral arms around two young stars. The mechanisms that have generated these structures are not very clear.

Recent studies based on computer simulations suggest that such structures may indicate the presence of giant planets "invisible" (too faint to be seen with existing tools). A comparison between simulations and direct observations may be able to obtain not only the position of the planet but also its mass.
The method proposed in addition to opening a new avenue for detecting extrasolar planets also offers a new look at the mechanisms that act in the early stages of planet formation.

To know more:
http://arxiv.org/abs/1507.03596
http://arxiv.org/abs/1507.03599
http://arxiv.org/abs/1511.01178
http://arxiv.org/abs/1412.3412
http://hubblesite.org/newscenter/archive/releases/2015/40/full/

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NO CORRELATION BETWEEN FERMI GBM SIGNAL AND GW150914

Image: Merging black holes. Credit: NASA Recently it has been suggested that electromagnetic signals detected by Fermi GBM could be associated with the merger of the two black holes detected by LIGO ( GW150914 ).

STELLAR MASS GROWTH OF SPIRAL GALAXIES IN THE COSMIC WEB

Image: An illustration of the cosmic web. Credit: NASA/NCSA University of Illinois Visualization by Frank Summers, Space Telescope Science Institute, Simulation by Martin White and Lars Hernquist, Harvard University The distribution of galaxies in the Universe forms a vast network of interconnected filamentary structures, sheets, and clusters which are separated by immense voids. This vast foam-like structure sometimes is called the "cosmic web".

Scientists detect comets outside our solar system

An artist’s conception of a view from within the Exocomet system KIC 3542116. Credit: Danielle Futselaar Team of professional and citizen scientists identifies tails of comets streaking past a distant star Jennifer Chu | MIT News Office Scientists from MIT and other institutions, working closely with amateur astronomers, have spotted the dusty tails of six exocomets — comets outside our solar system — orbiting a faint star 800 light years from Earth. These cosmic balls of ice and dust, which were about the size of Halley’s Comet and traveled about 100,000 miles per hour before they ultimately vaporized, are some of the smallest objects yet found outside our own solar system. The discovery marks the first time that an object as small as a comet has been detected using transit photometry, a technique by which astronomers observe a star’s light for telltale dips in intensity. Such dips signal potential transits, or crossings of planets or other objects in front of a star, ...

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