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Lars Occhionero
Works at Steno Museet
Attends University of Aarhus
Lives in Risskov
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In case you missed it. +NASA has announced it has found the earth-size planet in a star's habitable zone, meaning the first true "Earth Twin" using data from Kepler. This is very exciting! Next step would be to see if it's possible to get a signal from the atmosphere's spectrum. That would reveal what the atmosphere is made of, and could possibly tell us if there is life (or possibility of life) in the planet. Great news! 
#Kepler #KASC 
NASA and JPL have announced the discovery of an Earth-sized planet orbiting in the habitable zone of its star. The planet is named Kepler-186f, and is the 5th planet from its star, Kepler 186.
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A great gif. Conservation of Energy made real
 
THIS GUY . . . right?!

Probably the best GIF ever made. #boop  
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Fantastic
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A primer in the history of Gravity (the theory) 
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Well, yes, agreed
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Blizzard being April 1. hilarious :D 
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That is hilarious! 
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Had to look up 'vaxxer', but that it really quite good :-D

I'm definitely pro vaxxer. My son's first vaccination might have initiated an autoimmune disease not previously registered in Danish children, but he is getting all of the vaccines anyways. 
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Fysikshow Århus, now on +Veritasium thanks to +Derek Muller and +Klaus Seiersen  :D 
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A must see video by +Henry Reich. Not about Physics, but about a very insane situation in Venezuela. I really do not understand why we, starstuff given the ability to try and understand itself, capable of marvelous things, continue fighting each other... Mostly for the transference of small pieces of paper, that clearly doesn't make us happier.... 
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+David Lecaille Don't be silly, America could not care less about Venezuela, America is now much more worried about Europe and Asia.
Now, that hydrocarbon have flowing from American soil again, American depend even less from Venezuela. 
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Consume Mass Quantities

One of the big questions many people have about black holes is what happens when something enters one.  A recent Cosmos episode not withstanding, there is no reason to suspect that entering a black hole would take you to an alternate universe.  If you were to fall into a black hole, you would simply be in the black hole.  What happens to you after that depends upon the nature of quantum gravity, which we still don’t fully understand.

Of course all of this is according to general relativity.  While general relativity has been confirmed by multiple experiments, what evidence do we have of things falling into a black hole?  It turns out we have lots of broad evidence, and a bit of specific evidence.  The broad evidence comes from the observation of active galactic nuclei (AGN), which includes things like quasars, blazars and radio galaxies.  These highly energetic objects are powered by active black holes.  Comparison of these objects to black hole models show strong agreement.  We know, for example, that black holes can develop an accretion disk of matter being consumed, as well as large jets of particles streaming from their poles.

We also have some evidence of black holes consuming individual stars. In 2011, the Pan-STARRS  telescope observed what initially appeared to be a supernova at the center of a galaxy about 2.7 billion light years away.  The spectrum of this burst indicated a large presence of helium, but no evidence of hydrogen.  This means it was not likely just some gas captured by the black hole (which would be a mix of helium and hydrogen), but rather due to the core of an old star (which is mostly helium) being captured.

Closer to home, we can observe a cloud of gas near the supermassive black hole in our own galaxy as it is gradually being torn apart.  In this case the cloud isn’t directly being consumed by the black hole, but the way in which the cloud is being torn apart has matched computer simulations of such close encounters.

So we actually have a good understanding of what happens to things as they fall into a black hole.  There are still questions yet to be answered, but our black hole models are rooted in observational evidence.

Image: Simulation of a star near a black hole. NASA/JPL-Caltech/JHU/UCSC
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138 days, and some hours (quite fast really!) http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA15429
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An asteroid with rings, detected using lightcurves, the same way we find planets. Might this be a way to find rings around exoplanets as well? :D
 
Put a Ring On It

Astronomers have found an asteroid with a ring system, and the results have been published Nature (pdf: http://goo.gl/kvPF2u). While this is the first discovery of a ring system about an asteroid, such a thing isn’t entirely unexpected.  We have known for a while that asteroids can have moons, for example.  But what’s particularly interesting is how they discovered these rings.

The asteroid in question is known as  Chariklo, a 130 kilometer wide object that orbits between the orbits of Saturn and Uranus.  It is the largest example of the Centaur group, which are likely Kuiper belt objects that were captured by the gravitational pull of the outer planets.  In the Summer of 2013, Chariklo passed in front of a dim, 12th-magnitude star as seen from parts of South America.  It is a phenomenon known as an occultation.

Such an event is a great opportunity to better determine the size and shape of an asteroid, so a team of astronomers dispersed through Brazil, Argentina, Uruguay and Chile made observations of the occultation.  Since each observation is made from a different vantage point, Chariklo’s occultation of the background star occurs at a slightly different orientation.  By combining these different observations the team could map the overall shape of the asteroid.

But what the team found was that from some vantage points the background star dimmed a couple times before being occulted by Chariklo, then dimmed a couple times after the occultation as well. Analysis of these pre and post dips makes it pretty clear that there are at least two rings around the asteroid.

Knowing that Chariklo has a ring system, the team was also able to determine a bit about the composition of the rings.  As Chariklo (or any other ringed object) orbits the Sun, there are times when the rings are seen more edge on, and times when we see more of the rings.  The team compared spectral observations of the asteroid between 1997 and 2008, and found that the asteroid gradually dimmed during that period.  The observation of water ice in the spectrum also faded during that period.  This would be consistent with a ring system containing ice (which is very reflective) gradually shifting to an edge-on orientation.

One of the more surprising aspects of the discovery is that the rings are so sharp and dense.  Typically a ring system would diffuse over time unless there are shepherd moons to keep the rings in order.  So it may be that Chariklo has not only a ring system, but a moon system as well.

To determine whether that is the case, it will likely take some high resolution imaging.  But that remains to be seen.

Image: Lucie Maquet

Paper:  F. Braga-Ribas, B. Sicardy, et al. A ring system detected around the Centaur (10199) Chariklo. Nature (2014) doi:10.1038/nature13155.
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that´s Incredible, tambien he visto naves espaciales es reealmente algo que nunca habia visto, dicen que nos quieren invadir.....esa es la pregunta???????
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In his circles
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Work
Occupation
Master student in astrophysics, Lecturer at Steno Museum and physics teacher at Varde Gymnasium og HF
Skills
Scientific teaching, time-series analysis, astrophysics
Employment
  • Steno Museet
    Planetarieassistent og Foreviser, 2006 - present
  • Freelance
    Public Lecturer, 2000 - present
  • Varde Gymnasium og HF-Kursus
    Physics Teacher, 2011 - 2012
  • Østerbyens Dyrlæger
    2005 - 2005
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Risskov
Previously
Campobasso - Ripalimosani - Nordenskov
Story
Tagline
Astrophysicsist in training and geek
Introduction
I'm an astophysics, master student at Aarhus University.
Sometimes i work at the Steno Musemum in the planetarium.
In my spare time i do politics, play guitar, read and watch movies and foremost play roleplaying games, pen and pape and lots of Live Action.


Bragging rights
Cashier @ Ripen LiveRollespil, Organizer of Ork-scenerio I and II, Organizer of Nano-camp 2005
Education
  • University of Aarhus
    Master - Astrophysics, 2009 - present
  • University of Aarhus
    Bachelor - Physics and Astronomy, 2005 - 2009
  • Varde Gymnasium og HF-kursus
    High-School: Science, 2002 - 2005
  • Næsbjerg Skole
    Basic School, 1999 - 2002
  • Nordenskov Skole
    Basic School, 1996 - 1999
  • Scuola Elementare Ripalimosani
    Basic School, 1993 - 1996
  • Scuola Elementare "Giovanni Paolo II", Campobasso
    Basic School, 1992 - 1993
  • Primina in "Regina Mundi", Campobasso
    Basic School, 1991 - 1992
Basic Information
Gender
Male
Birthday
June 9
Relationship
Engaged
Other names
Vittorio Traiano
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