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nasa's kepler spacecraft has discovered

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kepler-10b its first confirmed rocky

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planet and the smallest transiting

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exoplanet discovered to date

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kepler-10b is only 1.4 times the size of

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earth and has an average density of 8.8

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grams per cubic centimeter similar to

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that of an iron dumbbell

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the planet orbits its star in only 0.84

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days and is not in the habitable zone

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this rocky planet is not like any of the

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rocky planets in our own solar system it

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orbits its parent star with a period of

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less than one day only 0.8 days is what

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it takes to orbit the star once

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and because it's so close to its parent

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star

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the the day the day side of that planet

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is scorching hot it's about 1800 degrees

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kelvin which is hot enough to uh melt

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the rocks on the surface so that day

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side of the planet is is quite molten we

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believe the other thing that makes this

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such a special result is that we've got

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all the best capabilities of kepler

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converging on this one discovery we've

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got the very high precision photometry

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from the spacecraft we've got the

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highest possible precision doppler

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measurements from our our ground-based

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telescopes and we've got the

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astroseismic analysis which allows us to

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pin down the properties of the star with

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very high precision this discovery is a

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milestone not just for our team because

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it's our first rocky planet but it

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really is a milestone for for humanity

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in in general and for exoplanet studies

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there's only one other object known to

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humanity which is kind of in this regime

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that we might that might be rocky but

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this is the first detection that really

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is unquestionably a rocky planet

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we measure the diameter of the planet by

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how much light is blocked as the planet

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blocks in the starlight we measure the

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mass of the planet by how strongly the

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planet yanks on the host star and

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putting those two together we learn the

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density of the planet this one planet

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kepler 10 has a density of 8 grams per

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cubic centimeter the earth in comparison

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is only 5.5 grams per cubic centimeter

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so you can see this kepler-10 planet has

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a density greater than that of the earth