Three basic principles govern the course we recommend. The first is the “flexible path” approach that the Augustine commission advocated and that President Obama and Congress accepted.

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by 刘貂儿 | 2013-07-17

MANY a youngster, Babbage included, has dreamed of going into space. But becoming an astronaut is a hard slog. Sandy Antunes suggests a less daunting proxy. An astrophysicist and programmer with decades of NASA experience, Dr Antunes is a proponent of pic

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by 刘貂儿 | 2012-12-28

Discovered by a U.S.-Franco research team, its radius is twice that of Earth's with a mass eight times greater. That would give it the same density as Earth, although previously observed diamond planets are reckoned to be a lot more dense. It is also incr

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by 刘貂儿 | 2012-12-28

An international team of astronomers has tracked a star that whizzes around the Milky Way’s central supermassive black hole in only 11.5 years. The star, labeled S0-102, has the shortest orbital period yet for any star discovered looping around our galaxy

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by 刘貂儿 | 2012-12-28

Astronomers have used NASA’s Spitzer Space Telescope to obtain the most precise measurement yet of the Hubble constant, which is the rate at which the universe is expanding. The Hubble constant is named for Edwin Hubble, the astronomer who discovered that

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by 刘貂儿 | 2012-12-28

A planet which really does twinkle like a diamond in the sky has been discovered by scientists - its surface is littered with the precious stones.

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