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zahire mohammad
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Analysis of data from the European Space Agency’s Planck mission has found out some pretty cool new things about our universe, including:

- It's older than we believed, at about 13.81 billion years.
- It's expanding more slowly than we expected.
- It's made up of 4.9 percent normal matter, 26.8 percent dark matter, and 68.3 percent dark energy.
- And finally, that it's a tiny bit lopsided.

Read more here: http://slate.me/Yci6Bi

via fb.me/scienceisseriouslyawesome
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zahire mohammad

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Richard Hammond has used the latest camera technology to capture an explosion in super slow-motion to see the destructive power of the shockwave in action. The power of an explosion is not from the blast itself but from the shockwave it creates - despite it being invisible to the naked eye. Thousands of pounds worth of gunpowder were used to create the controlled blast in New Mexico. 


video • Richard Hammond's Invisible Worlds-Shockwave of Massive Explosion
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zahire mohammad

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MATHS • SIMPLE VISUAL • How Trigonometry Works
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This should be the first thing shown in all trigonometry classes
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Image► http://goo.gl/jE4yg Trigonometry ► http://goo.gl/kmWic
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#هل_تعلم  
هل تعلم أن أول من تمنى الموت؟ يوسف عليه السلام
هل تعلم أن أول ما يرفع من أعمال هذه الأمة؟ الصلوات الخمسة
هل تعلم أن أول صلاة صلاها محمد صلى الله علية وسلم ؟ صلاة الظهر
هل تعلم أن أول من تنشق عنه الأرض يوم القيامة؟ محمد ﷺ صلى الله علية وسلم
هل تعلم أن أول من يقرع باب الجنة؟ محمد ﷺ صلى الله علية وسلم
هل تعلم أن أول شافع وأول مشفع؟ محمد ﷺ صلى الله علية وسلم
هل تعلم أن أول أمة تدخل الجنة؟ أمة محمد ﷺ صلى الله علية وسلم
هل تعلم أن أول من أذن في السماء؟ جبريل عليه السلام
هل تعلم أن أول من قدر الساعات الاثنى عشرة؟ نوح عليه السلام في السفينة ليعرف مواقيت الصلاة
هل تعلم أن أول من ركب الخيل؟ إسماعيل عليه السلام
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Jupiter and the Sun are the two largest objects in our Solar System, and as they orbit around one another, they create regions where their gravity roughly cancels out. These are the Lagrangian points, created whenever two objects orbit one another: places where gravity is such that another small object can follow along in the orbit without being pulled in or out. And since things aren't getting pulled out of there, they get stuck in there as well: and so we have two large clumps of asteroids (and miscellaneous smaller space debris) in Jupiter's orbit. These are called the Trojan Asteroids; the group ahead of Jupiter is known as the Greek Camp, and the group behind it the Trojan Camp, with the asteroids in each camp being named after famous people in that war. Together, these two camps have as many asteroids as the Asteroid Belt.

Other stable patterns are possible, too: another one is what's called a 3:2 resonance pattern, asteroids whose motion gets confined to a basically triangular shape by the combined pull of Jupiter and the Sun. This group (for Jupiter) is called the Hilda Family, and their route forms a triangle with its three points at the two Lagrange points and at the point on Jupiter's orbit directly opposite it from the Sun. 

None of these orbits are perfectly stable, because each of these asteroids is subject to pulling from everything in the Solar System; as a result, an asteroid can shift from the Lagrange points to the Hilda family, and from the Hilda family to the Asteroid Belt (not shown), especially if it runs into something and changes its course. 

The reason that Pluto was demoted from planet to dwarf planet is that we realized that these things are not only numerous, but some of them are quite big. Some things we formerly called asteroids are actually bigger than Pluto, so the naming started to seem a little silly. So our Solar System has, in decreasing order of size, four gas giant planets (Jupiter, Saturn, Neptune and Uranus); four rocky planets (Earth, Venus, Mars, and Mercury); five dwarf planets (Eris, Pluto, Haumea, Makemake, and Ceres); and a tremendous number of asteroids. Ceres orbits in the Asteroid Belt, about halfway between Mars and Jupiter, just inside the triangle of the Hilda Family; Pluto and Haumea are both in the distant Kuiper Belt, outside the orbit of Neptune but shepherded by its orbit in much the same way that the Hildas are shepherded by Jupiter; Makemake is what's called a "cubewano," living in the Kuiper Belt but unshepherded, orbiting independently; and Eris is part of the Scattered Disc, the even more distant objects whose orbits don't sit nicely in the plane of the Solar System at all, having been kicked out of that plane by (we believe) scattering off large bodies like Jupiter.

But mostly, I wanted to share this to show you how things orbit. This picture comes from the amazing archive at http://sajri.astronomy.cz/asteroidgroups/groups.htm, which has many other such pictures, and comes to me via +Max Rubenacker

More information about all of these things:
http://en.wikipedia.org/wiki/Lagrangian_point
http://en.wikipedia.org/wiki/Trojan_(astronomy)
http://en.wikipedia.org/wiki/Hilda_family
http://en.wikipedia.org/wiki/Dwarf_planet
http://en.wikipedia.org/wiki/Scattered_disc

#ScienceEveryDay
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