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'Brighter than a full moon': The biggest star of 2013... could be Ison - the comet of the century - Science - News

'Brighter than a full moon': The biggest star of 2013... could be Ison - the comet of the century - Science - News
Comet Ison could draw millions out into the dark to witness what could be the brightest comet seen in many generations – brighter even than the full Moon. It was found as a blur on an electronic image of the night sky taken through a telescope at the Kislovodsk Observatory in Russia as part of a project to survey the sky looking for comets and asteroids – chunks of rock and ice that litter space. Astronomers Vitali Nevski and Artyom Novichonok were expecting to use the International Scientific Optical Network's (Ison) 40cm telescope on the night of 20 September but clouds halted their plans. It was a frustrating night but about half an hour prior to the beginning of morning twilight, they noticed the sky was clearing and got the telescope and camera up and running to obtain some survey images in the constellations of Gemini and Cancer. When the images were obtained Nevski loaded them into a computer program designed to detect asteroids and comets moving between images.

This is Turnip Rock in Michigan, USA Yep, we just smashed two spacecraft into the Moon Not sure if this is tongue in cheek comment, but how would you propose to recycle them when they are in orbit around the moon with no fuel? It's not like we have a service truck to go out there and do an easy pick-up like a regular washing machine. Also, the controlled crash revealed information about the crust so it was still worthwhile scientifically. It was fully tongue-and-cheek. As it turns out, due to gravitational anomalies (remnants of old impacts under the surface, not any woo-woo with gravity), it's essentially impossible to maintain a stable, low orbit around the moon. Well, if they were going to crash anyway, might as well control it and learn something in the process. If they can get recycling service orbiting the moon, that's just gonna make me angrier that we still don't have it in my neighborhood.

Philosophie verständlich : Willensfreiheit : Harry G. Frankfurt Hauptwerke 1988 The Importance of What We Care About1999 Necessity, Volition, and Love Der klassische Kompatibilismus von Thomas Hobbes und David Hume setzt Freiheit mit Handlungsfreiheit gleich und definiert Handlungsfreiheit als die Fähigkeit, tun zu können, was man tun will. Wünsche erster und zweiter Stufe Menschen haben – wie viele andere Lebewesen auch – Wünsche: Sie wünschen sich Nahrung und Kleidung, eine neues Auto oder besseres Wetter und vieles mehr. Einen Wunsch zweiter Stufe habe ich zum Beispiel, wenn ich den Wunsch (erster Stufe) verspüre zu rauchen und gleichzeitig (auf der zweiten Stufe) wünsche, diesen Wunsch nicht zu haben. Bei den Wünschen erster Stufe unterscheidet Frankfurt Wünsche, die man einfach nur hat, von solchen, die tatsächlich handlungswirksam werden. Willensfreiheit nach Frankfurt Was bedeutet es, dass der Wille einer Person frei ist? Nehmen wir als Beispiel den Drogenabhängigen David. Freiheit und Verantwortlichkeit Kurzes Resümee Einwände Literatur

The Sun's Magnetic Field is about to Flip The Sun's Magnetic Field is about to Flip August 5, 2013: Something big is about to happen on the sun. According to measurements from NASA-supported observatories, the sun's vast magnetic field is about to flip. "It looks like we're no more than 3 to 4 months away from a complete field reversal," says solar physicist Todd Hoeksema of Stanford University. The sun's magnetic field changes polarity approximately every 11 years. Hoeksema is the director of Stanford's Wilcox Solar Observatory, one of the few observatories in the world that monitor the sun's polar magnetic fields. Solar physicist Phil Scherrer, also at Stanford, describes what happens: "The sun's polar magnetic fields weaken, go to zero, and then emerge again with the opposite polarity. A reversal of the sun's magnetic field is, literally, a big event. When solar physicists talk about solar field reversals, their conversation often centers on the "current sheet." During field reversals, the current sheet becomes very wavy.

Cybersleuths Uncover 5-Year Spy Operation Targeting Governments, Others | Threat Level Map showing the location and industry of victims in 69 countries hit by the spy operation. Courtesy of Kaspersky Lab An advanced and well-orchestrated computer spy operation that targeted diplomats, governments and research institutions for at least five years has been uncovered by security researchers in Russia. The highly targeted campaign, which focuses primarily on victims in Eastern Europe and Central Asia based on existing data, is still live, harvesting documents and data from computers, smartphones and removable storage devices, such as USB sticks, according to Kaspersky Lab, the Moscow-based antivirus firm that uncovered the campaign. Kaspersky has dubbed the operation “Red October.” While most of the victims documented are in Eastern Europe or Central Asia, targets have been hit in 69 countries in total, including the U.S., Australia, Ireland, Switzerland, Belgium, Brazil, Spain, South Africa, Japan and the United Arab Emirates.

The Most Extreme Weather In the Solar System “Fly me to the moon, let me play among the stars. Let me see what spring is like on Jupiter and Mars…” Spoiler alert: the weather Earth is far nicer than on any other planet in our solar system. Our Solar System is home to some fairly extreme weather. Mercury Mercury almost completely lacks an atmosphere, but that doesn’t mean that it doesn’t have extreme physical conditions. In addition to barely having an atmosphere, Mercury doesn't have much in the way of axial tilt. If a human were to visit Mercury, he or she would either burst into flames or freeze solid depending on where the spaceship landed. Venus Our neighbor Venus is essentially the poster child for how greenhouse gasses can create a completely hellish environment. Rain on Venus is almost purely sulfuric acid, which is extremely corrosive. Even with these extremely high temperatures, there is snow on Venus. Mars Mars’ missing atmosphere is a mystery but there is still plenty of bizarre weather happening on the planet. Jupiter Io

Okay... Don't move! Scientists to Io: Your Volcanoes Are in the Wrong Place Scientists to Io: Your Volcanoes Are in the Wrong Place Jupiter's moon Io is the most volcanically active world in the Solar System, with hundreds of volcanoes, some erupting lava fountains up to 250 miles high. However, concentrations of volcanic activity are significantly displaced from where they are expected to be based on models that predict how the moon's interior is heated, according to NASA and European Space Agency researchers. Io is caught in a tug-of-war between Jupiter's massive gravity and the smaller but precisely timed pulls from two neighboring moons that orbit further from Jupiter – Europa and Ganymede. For example, as Io gets closer to Jupiter, the giant planet's powerful gravity deforms the moon toward it and then, as Io moves farther away, the gravitational pull decreases and the moon relaxes. This is a map of the predicted heat flow at the surface of Io from different tidal heating models.

Segelqualle An den Strand gespülte Segelquallen Die Segelqualle (Velella velella) (syn. V. lata Chamisso & Eysenhardt, 1821) ist ein zu den Hydrozoen gehörendes Nesseltier (Cnidaria). Wegen ihres Baus wird die Qualle im Deutschen auch "Segler vor dem Wind" oder "Sankt-Peters-Schifflein" genannt[1] (Petrus: Schutzheiliger der Fischer). Merkmale[Bearbeiten] Die Meduse weist vier radiale Kanäle auf und besitzt zwei Paare sich gegenüber stehender perradialer Tentakeln, einen kurzen adaxialen Tentakel und einen langen abaxialen Tentakel. Segelqualle mit randständigen Wehrpolypen Geographische Verbreitung und Lebensweise[Bearbeiten] Segelquallen leben weltweit in tropischen und subtropischen Meeren (auch im westlichen Mittelmeer), und zwar an der Wasseroberfläche der Hochsee. Feinde[Bearbeiten] Zu den Feinden der Segelqualle gehören unter anderem die zu den Nacktkiemern gehörende pelagische Schnecke Glaucus atlanticus und die Veilchenschnecke (Janthina janthina). Fortpflanzung[Bearbeiten] Literatur[Bearbeiten]

Age of Saturn's Rings Pinned Down SAN FRANCISCO — Saturn's iconic rings likely formed about 4.4 billion years ago, shortly after the planet itself took shape, a new study suggests. The origin of Saturn's ring system has long been the subject of debate, with some researchers arguing that it's a relatively young structure and others holding that it coalesced long ago, at roughly the same time as the gas giant's many satellites. The new study, conducted using data gathered by NASA's Saturn-orbiting Cassini spacecraft, strongly supports the latter scenario, researchers said here Tuesday (Dec. 10) at the annual meeting of the American Geophysical Union. [Photos: Saturn's Glorious Rings Up Close] Cassini's measurements imply that "the main rings would be [extremely] old, rather than hundreds of millions of years old," Sascha Kempf, of the University of Colorado in Boulder, said. They found that a surprisingly small amount of dusty material comes into contact with the rings. Saturn Quiz: How Well Do You Know the Ringed Planet?

A gentle introduction to return-oriented programming « Hi, As I have promised in my last post I will start a series about return-oriented programming. I start with a short introduction about the topic. The introduction covers the origin of return-oriented programming, describes what return-oriented programming is and ends with a definition of return-oriented programming which I will use in the future posts. Why do we need return-oriented programming ? Return-oriented programming is a technique which allows an attacker to execute code in the presence of the following defensive measures. Non executable memory segments Code signing Where does return-oriented programming come from ? Return-oriented programming is a recently coined term which describes a technique that has been developed in an iterative process in the security community. Buffer overflows were first publicly documented in the Computer Security Technology Planning Study in 1972 (Appendix 1. Return-into-library technique Borrowed code chunks technique Return-oriented programming Tim