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Formation and evolution

Projected timeline of the Sun's life.

Diagram Solar System

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  • Apple Launches IBooks 2 E-Textbook Platform

    engadget.com 3 weeks, 6 days ago

    We're here at Apple's education-flavored event at the Guggenheim museum in New York City. Phil Schiller has just taken to the stage and announced the first half of Apple's platform that's going to "reinvent the textbook:" iBooks 2. Saying that there were 1.5 million iPads currently in use in Education (using 20,000 specific apps), the revamped book-stand now includes education-specific features to help the budding students of the world. You'll be able to paw through content, stopping to flick through detail

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Formation and evolution

Projected timeline of the Sun's life. The Solar System consists of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The vast majority of the system's mass is in the Sun. Of the many objects that orbit the Sun, most of the mass is contained within eight relatively solitary planets whose orbits are almost circular and lie within a nearly flat disc called the ecliptic plane. The four smaller inner planets, Mercury, Venus, Earth and Mars, also called the terrestrial planets, are primarily composed of rock and metal. The four outer planets, the gas giants, are substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are composed largely of ices, such as water, ammonia and methane, and are often referred to separately as "ice giants".

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