The Sukhoi Su-30 (Cyrillic: Сухой Су-30; NATO reporting name: Flanker-C) is a twin-engine, two-seat supermaneuverable fighter aircraft developed by Russia's Sukhoi Aviation Corporation. It is a multirole fighter for all-weather, air-to-air and air-to-surface deep interdiction missions.

The Su-30 started out as an internal development project in the Sukhoi Su-27 family by Sukhoi. The design plan was revamped and the name was made official by the Russian Defense Ministry in 1996. Of the Flanker family, only the Su-27, Su-30, Su-34 and Su-35 have been ordered into serial production by the Defense Ministry. All the others, such as Su-37, were prototypes. The Su-30 has two distinct version branches, manufactured by competing organisations: KnAAPO and the Irkut Corporation, both of which come under the Sukhoi group's umbrella.

KnAAPO manufactures the Su-30MKK and the Su-30MK2, which were designed for and sold to China, and later Indonesia, Uganda, Venezuela, and Vietnam. Due to KnAAPO's involvement from the early stages of developing Su-35, these are basically a two-seat version of the mid-1990s Su-35. The Chinese chose an older but lighter radar so the canards could be omitted in return for increased payload. It is a fighter with both air supremacy and attack capabilities, generally similar to the U.S. F-15E.

Irkut traditionally served the Soviet Air Defense and, in the early years of Flanker development, was given the responsibility of manufacturing the Su-27UB, the two-seat trainer version. When India showed interests in the Su-30, Irkut offered the multirole Su-30MKI, which originated as the Su-27UB modified with avionics appropriate for fighters. Along with its ground-attack capabilities, the series adds features for the air-superiority role, such as canards, thrust-vectoring, and a long-range phased-array radar. Its derivatives include the Su-30MKM, MKA, and SM for Malaysia, Algeria, and Russia, respectively. The Russian Air Force operates several Su-30s and has ordered the Su-30SM version.

The huge, mysterious hexagon at Saturn's north pole may finally have an explanation.

 

The bizarre hexagonal cloud pattern was first discovered in 1988 by scientists reviewing data from NASA's Voyager flybys of Saturn in 1980 and 1981, but its existence was not confirmed until NASA's Cassini spacecraft observed the ringed planet up-close years later.

Nothing like the hexagon has ever been seen on any other world. The structure, which contains a churning storm at its center, is about 20,000 miles (32,000 kilometers) wide, and thermal images show that it reaches roughly 60 miles (100 km) down into Saturn's atmosphere.

Scientists have bandied about a number of explanations for the hexagon's origin. For instance, water swirling inside a bucket can generate whirlpools possessing holes with geometric shapes. However, there is of course no giant bucket on Saturn holding this gargantuan hexagon.

Voyager and Cassini did identify many features of this strange hexagon that could help explain how it formed. For example, the points of the hexagon rotate around its center at almost exactly the same rate Saturn rotates on its axis. Moreover, a jet stream air current, much like the ones seen on Earth, flows eastward at up to about 220 mph (360 km/h) on Saturn, on a path that appears to follow the hexagon's outline.

Now researchers have developed a model they suggest matches the hexagon's features better than previous attempts.

"With a very simple model, we have been able to match many of the observed properties of the hexagon," study lead author Raúl Morales-Juberías, a planetary scientist at the New Mexico Institute of Mining and Technology, told Space.com.

Playing a vital role in our everyday lives, technologies based on light are in use all around us. From art and science to modern technology, the study of light - and how behaves and interacts with matter has intrigued scientists for over a century.

This year, 2015, marks the 1,000th anniversary of the Kitab al-Manazir (The Book of Optics), a seven-volume treatise written by the Iraqi scientist Ibn al-Haytham - a pioneering thinker who's views have been crucial to our understanding of how the universe came into existence.

Shaping our understanding of vision, optics and light, Ibn al-Haytham interrogated theories of light put forward by the Greeks - men like Plato and Euclid who argued that the way we see objects is by shining light out of our eyes onto them.

Ibn al-Haytham argued instead, and correctly, that the way we see is by light entering our eyes from outside either reflecting off objects or directly from luminous bodies like candles or the sun.

His methodology of investigation, in which he combined theory and experiments, were also remarkable for their emphasis on proof and evidence.

In the first episode of Science in the Golden Age, theoretical physicist, Jim al-Khalili, looks at state-of-the-art applications of optics and traces the science of light back to the medieval Islamic world.

Al-Khalili recreates Ibn al-Haytham's famous 'camera obscura' experiment with stunning results and also uncovers the work of Ibn Sahl, a mathematician and physicist associated with the Abbasid court of Baghdad.

According to a recently discovered manuscript, he correctly described "Snell's law of refraction" centuries before Dutch astronomer Willebrord Snellius was even born.

We also look at the work of Ibn Mu'adh, who brought together knowledge of optics and geometry in order to estimate the height of the atmosphere.