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Pluto is a dwarf planet. A dwarf planet travels around, or orbits, the sun just like other planets. But it is much smaller. Clyde Tombaugh discovered Pluto in 1930. He was an astronomer from the United States. An astronomer is a scientist who studies stars and other objects in space. Venetia Burney named Pluto that same year. She was an 11-year-old girl from England. Pluto is not very big. It is only half as wide as the United States. Pluto is smaller than Earth's moon. This dwarf planet takes 248 Earth years to go around the sun. If you lived...

Security researcher @dfirblog has discovered what he calls a devastating flaw in Windows' Kerberos authentication system. The flaw cannot be fixed and the only solution is to introduce and use Microsoft's Credential Guard program to prevent passwords from being stored in memory, according to his extensive blog post. The flaw results from how the third-party authentication system creates secret keys: by using the password associated with a disabled username (krbtgt). That password is rarely changed, making it possible to bypass the authentication system altogether and allow an attacker to grant themselves admin privileges, as well as create secret passwords for...

Explanation: What do the moons of Pluto look like? Before a decade ago, only the largest moon Charon was known, but never imaged. As the robotic New Horizons spacecraft was prepared and launched, other moons were identified on Hubble images but remained only specks of light. Finally, this past summer, New Horizons swept right past Pluto, photographed Pluto and Charon in detail, and took the best images of Styx, Nix, Kerberos, and Hydra that it could. The featured image composite shows the results -- each moon is seen to have a distinct shape, while underlying complexity is only hinted. Even...

Edging within 7,800 miles of its surface at 7:49 a.m. EDT, the spacecraft’s long-range telescopic camera will resolve features as small as 230 feet (70 meters). Fourteen minutes later, it will zip within 17,930 miles of Charon as well as image Pluto’s four smaller satellites — Hydra, Styx, Nix and Kerberos. Graphic showing New Horizons’ busy schedule before and during the flyby. Credit: NASA fter zooming past, the craft will turn to photograph Pluto eclipsing the Sun as it looks for the faint glow of rings or dust sheets illuminated by backlight. At the same time, sunlight reflecting off Charon...

The dwarf planet Pluto and its system of five moons are about as mysterious as the underworld of antiquity that inspired their names. ... “We are still baffled by how the system formed,” says study co-author Mark Showalter, a senior research scientist at the Search for Extraterrestrial Intelligence (SETI) Institute. “I think everyone believes that, at some point in the distant past, a large object bashed into ‘proto-Pluto’ and the moons formed out of the debris cloud. However, after that point in the story, details get very sketchy.” Now, analysis of data collected from the Hubble Space Telescope following the...

Explanation: Pluto's newly discovered moons now have names. Known previously as P4 and P5, the International Astronomical Union has now given the fourth and fifth discovered moons of Pluto the names Kerberos and Styx. The small moons were discovered in 2011 and 2012 by the Hubble Space Telescope in preparation for the close passing of the New Horizons spacecraft by Pluto in 2015. Kerberos is named for the many headed dog in Greek mythology that guards the entrance to the underworld, while Styx is named for the goddess who overlooks the mythological river that runs between the Earth and the...

The recently discovered fourth and fifth moons of Pluto now have official names: Kerberos and Styx. The International Astronomical Union (IAU), charged with making official name designations, stipulates in its rules that names derive from mythology. The names - referring to a three-headed dog and a river separating the living from the dead, ranked second and third in an international public vote. The winning submission, Vulcan, was vetoed by the IAU. The two moons, formerly known simply as P4 and P5, were only discovered in July 2011 and July 2012, respectively.

Security researchers have warned of a flaw in communications software that could allow attackers to take over computers running Windows, Unix-based operating systems and Mac OS X, as well as Kerberos authentication systems. The problem is widespread because it affects some implementations of XDR (external data representation) libraries, used by many applications as a way of sending data from one system process to another, regardless of the system's architecture. The affected libraries are derived from Sun Microsystems' SunRPC remote procedure call technology, which has been taken up by many vendors. The Computer Emergency Response Team (CERT), a security network...