Three ‘super-Earth’ planets discovered orbiting in habitable zone of nearby star

Artist's conception of the view from one of three super-Earth planets orbiting the star Gliese 667C, showing all three stars of the Gliese 667 system.
Artist’s conception of the view from one of three super-Earth planets orbiting the star Gliese 667C, showing all three stars of the Gliese 667 system. Credit: ESO

There is some exciting news today regarding exoplanets – for the first time, multiple planets have been found orbiting within the habitable zone of their star, the region where temperatures can allow liquid water to exist on planets with rocky surfaces, like Earth. The news release was published this morning by the European Southern Observatory (ESO).

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Searching for life in Europa’s ocean – with a tiny submarine

Artist's conception of DADU exploring ice-covered waters. Credit: Jonas Jonsson / Angstrom Space Technology Centre of Uppsala University
Artist’s conception of DADU exploring ice-covered waters.
Credit: Jonas Jonsson / Angstrom Space Technology Centre of Uppsala University

For decades, Jupiter’s moon Europa has been the focus of fascination and debate. Why? Because it has a global ocean – a deep, salty ocean similar to those on Earth, except that in Europa’s case it is always covered by a crust of ice. Speculation has grown that there could be life of some kind in that alien watery darkness, and now there is a new proposal for how to look for it – a tiny submarine!

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Martian meteorite contains clay with chemical needed for life

Electron microscope image of some of the clay veins in the Martian meteorite MIL 090030, which contain boron. Credit: University of Hawaii at Manoa NASA Astrobiology Institute (UHNAI)
Electron microscope image of some of the clay veins in the Martian meteorite MIL 090030, which contain boron. Credit: University of Hawaii at Manoa NASA Astrobiology Institute (UHNAI)

The many orbiters, landers and rovers have, and continue to, send back an increasing wealth of information about Mars. Sometimes though, we are lucky enought to have a piece of Mars come to us instead. A bunch of Martian meteorites have been found over the years, in places like Antarctica. They offer a unique, hands-on peek into the geological history of the Red Planet. Now, one of them has yielded more clues to the possibility of life having started there, it was reported on June 11, 2013.

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Does Saturn’s moon Dione also have a subsurface ocean?

The cratered surface of Dione, as seen by Cassini. Did (or does) an ocean lurk beneath the surface? Credit: NASA / JPL / Space Science Institute
The cratered surface of Dione, as seen by Cassini. Did (or does) an ocean lurk beneath the surface? Credit: NASA / JPL / Space Science Institute

The outer solar system was once thought to be not much more than a frozen wasteland, at least in terms of the many moons orbiting the gas and ice giant planets. But with the intriguing discoveries made by robotic probes such as Voyager, Galileo and Cassini, we now know differently.

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