Whatever the answer, a planet once strikingly similar to ours has become a thoroughly alien place.
Unidentified Man: Is Neptune a planet, because everybody knows that Neptune's orbit is crossed by Pluto's.
We really don't know what sort of composition a planet the size of Kepler-22b would have.
They used it to detect methane in the atmosphere of a planet nearly 63 light-years away.
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The big question is, is the planet destined to become a planet of slums?
Over hundreds of thousands of years, this object accumulates enough material to become a planet.
One got demoted as a planet and the other is the butt of jokes.
Years ago I heard a definition for a planet that had to do with its atmosphere.
Astronomers will vote next week on whether to change the definition of a planet.
And it's not even that Pluto's twin, Charon, is going to be a planet too.
Variations in these brightness patterns might reveal the presence of a moon orbiting a planet.
The first direct image of a planet orbiting around another star is still some years away.
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He is also well aware that we live on a planet full to bursting with consumer goods.
We know that Earth, which was spun off from the sun, is a planet with a beginning.
This provides us with the first real image of a planet situated 25 light years from Earth.
According to theory, a planet the size and mass of Gliese 581c should be rocky, like the Earth.
The game opens back on Pandora, a planet with a Wild West mentality and penchant for outlaw justice.
However, the researchers believe that a survey of 500 or so dwarf stars could discover such a planet.
This causes debris to clump together in that region, creating a planet in just a few thousand years.
One of the first, a planet called Rocktropia, brings recording companies, artists and gamers together in a virtual world.
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Scientists observing a distant galaxy catch a black hole in the middle of destroying a planet larger than Jupiter.
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"There are dust discs around young stars that condense until they become the structure of a planet, " Vigo says.
The Independent is among the papers to reveal that astronomers have discovered a planet straight out of Star Wars.
This was because they saw the black-drop effect in a transit of Mercury, a planet that has no atmosphere.
It is the third criterion that is being targetted by those who would see Pluto reinstated as a planet.
They proclaimed the observation as the first visual - albeit indirect - proof of a planet outside our Solar System.
The duty that we have to bring to the next generations a planet that shall not be facing major disasters.
Even on a planet ruled by women, they are only rulers because they are in fact ruling it like men.
However, the likelihood of such life developing is lower than that of a planet that could be considered more Earth-like.
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