This is the process of differentiation and it is something evident in the fully formed terrestrial planets like Earth and Mercury.
If it has an atmosphere like Earth's, with a corresponding greenhouse effect, its average surface temperature would be a balmy 22C.
This planet appears to be small and rocky, a bit like Earth, but hardly, as NPR's Richard Harris reports, a vacation destination.
But we believe in mythical things here, like Earth and Santa.
Looks like Earth is under a full-blown attack this time around, and Thor will have to do battle in multiple realms to stop the villains this time around.
There is also a planet called Gliese-581g, discovered in September 2010, which is thought to be even more like Earth than Kepler-22b in terms of its suitability for plants and animals.
Like Earth, Titan's atmosphere is composed primarily of nitrogen, but the liquids and vapors on the moon's surface are made of methane and other organic chemicals integral to the creation of complex life.
Mr. JACK LISSAUER (NASA): This is likely to be or plausibly the first rocky planet around a normal star other than the sun, and in that sense it's a class of planets like Earth.
Mars is more like Earth than any other place in the known universe, and while astronomers now believe there may be millions of earth-like planets in our galaxy, Mars is the only one that is within reach.
It seems there are now going to be two kinds of planets: the real thing, like Earth and Mars and Jupiter, and then something called plutons, which are funny things that are kind of planets and kind of not planets.
At 4 am, when the wake-up bells ring each morning, the tall trees smell like earth and fog creeps around the elegant Burmese-style pagodas and gazebos, making their statues of mythical lions and other creatures look as though they have just emerged from another world.
And water would be all the more exciting on Ganymede because it is the largest moon in the solar system (larger even than the planets Mercury and Pluto) and, like earth, it has a permanent magnetic field that protects part of its surface from bombardment by certain sorts of life-destroying radiation.
The atmosphere of Mars today is like the Earth's atmosphere is like at 100, 000 feet.
According to theory, a planet the size and mass of Gliese 581c should be rocky, like the Earth.
Astronomers say they have found a planet orbiting a distant star that's more like the Earth than any other found so far.
He saw mountains casting shadows on the moon and realised this body was a world, like the Earth, endowed with complicated terrain.
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Looking down on the nearby Chrysler Building and the nose of the Flatiron Building was unreal, like Google Earth or tilt-shift photography jumping into reality.
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He said Katherine Jackson was "like Mother Earth" to her family.
For example, the Nexus One when released was capable of running apps like Google Earth that devices such as the Droid could not, because it ran Android 2.0, not 2.1.
Argentina had held the upper hand in the early exchanges, but suddenly fear ran through the South American ranks like an earth tremor every time Owen took possession.
Specialty metals include metals like rare earth elements, which are being used more often in applications such as consumer electronics, solar panels and magnets used to power hybrid vehicles.
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The team has published an article in the May 15th issue of Nature which provides evidence that stockmarkets before a crash behave rather like the earth before a big earthquake.
Yet many areologists, as students of Mars are sometimes known, could not let go of the idea that the object of their affections was once an active world like the earth.
Organizations like Virgin Unite, the Virgin Group's non-profit foundation , and the Carbon War Room have joined with groups like the Earth Day Network to tackle tough social and environmental problems and to raise awareness in the next generation.
How often the Universe has planets truly like the earth - true earth twins, planets the size of the earth, rocky planets with a surface that supports liquid water - well, we don't have that number yet, but I'm optimistic we'll figure it out.
These new additions bolster an already extensive library of British TV classics on the service, encompassing shows such as the much loved Doctor Who, the critically acclaimed Ashes to Ashes, spy drama Spooks, highly-acclaimed mini-series Whitechapel, as well as must-see documentaries like Planet Earth.
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Environmental groups like Greenpeace and Friends of the Earth would like to see a switch to renewable and clean sources of energy such as solar, wind and hydro-electric power.
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But, based on the limited numbers of planets found so far, Dr Boss has estimated that each Sun-like star has on average one "Earth-like" planet.
What is this collision going to look like from the Earth, and how should people set about viewing it?
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