News tagged with rocky planet

How old are the first planets?

To build a planet you need lots of rubble and that means lots of heavy elements – stuff more massive than atoms of hydrogen and helium. The elemental composition of the collapsing nebula that gave birth to the Sun and the ...

dateAug 31, 2012 in Astronomy
shares0 comments 10

Image: A storm of comets around star Eta Corvi

( -- This artist's conception illustrates a storm of comets around a star near our own, called Eta Corvi. Evidence for this barrage comes from NASA's Spitzer Space Telescope, whose infrared detectors picked up indications ...

dateJul 24, 2012 in Space Exploration
shares0 comments 2

UKIRT discovers 'impossible' binary stars

( -- A team of astronomers have used the United Kingdom Infrared Telescope (UKIRT) on Hawaii to discover four pairs of stars that orbit each other in less than 4 hours. Until now it was thought that such close-in ...

dateJul 05, 2012 in Astronomy
shares0 comments 18

When stellar metallicity sparks planet formation

New research predicts the criteria needed for Earth-like planets to form around a star that have one-tenth the metallicity of our Sun. If researchers find small, rocky planets orbiting stars with lower metallicity, it may ...

dateApr 10, 2012 in Astronomy
shares0 comments 9

Mercury's magnetic field -- nipped in the bud

( -- Mercury, the smallest of the eight planets with a diameter of 4900 kilometres and the closest to the Sun, looks more like the Moon than the Earth from the outside. It is the only rocky planet that has a global ...

dateDec 23, 2011 in Space Exploration
shares2 comments 27