back to article NASA's Kepler telescope finds 5 new planets

NASA's Kepler space telescope has already uncovered new astronomical oddities and five large planets in its first six weeks of searching for Earth-like bodies outside our solar system. Although the quintet revealed by Kepler are all much larger than Earth and far too hot to harbor any life known to science, NASA said the …

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  1. John Smith 19 Gold badge
    Thumb Up

    so how do they get the density?

    But 16.5 earth readii in diameter (If I'm reading this right) and the density of Sytrofoam?

    Sounds more like a disk of something in orbit round a star. A *very* big disk

    solar collector?

    1. Anonymous Coward
      Go

      Mini Dyson Sphere

      Or a big Death Star orbiting a nearby forest moon.

      Or a Styrofoam planet?

      You decide.

    2. Anonymous Coward
      Boffin

      Assumptions

      I'm guessing they are assuming spheres (which generally is not unreasonable) if we know the orbital period and the distance from the star then the mass is known, if we know the diameter then we know the density.

      as for disks in space, I thought that giant dominos were de rigueur.

  2. rchrd

    Great, but how far away?

    Annoying thing about this article and the one on the NASA website is that it neglects to say how far away this solar system is from ours. Wonder why?

    1. twelvebore
      Boffin

      Very uncertain, probably very distant

      The patch of sky Kepler is looking at mostly contains stars which are a fair distance away (thousands of parsecs). Measuring the distances of stars that far away is difficult, the results usually have large error-bars. That's probably why the distances aren't mentioned - they're unknown to a precision worth quoting.

  3. TeeCee Gold badge
    Joke

    Easy one.

    "Kepler 7b has about the same density as Styrofoam."

    It's obviously new. I'm sure that whoever ordered it from Magrathea will get around to unpacking it soon and it'll become a perfectly normal, earth-type planet, briefly surrounded by huge chunks of styrofoam until the cleaners hoover up.

    1. Stoneshop Silver badge
      Thumb Up

      They should ship them packed in bubble wrap

      Because, you know, the new owners will then get the additional pleasure of popping all those bubbles. It'll also be a lot easier to clean up; just roll up the deflated sheets and tow them back for recycling.

    2. Anonymous Coward
      Go

      Box

      It's probably a box of disks from HP.

  4. Anonymous Coward
    Joke

    going forward

    "...but plan to analyze them going forward."

    but what about planets with retrograde orbits?

  5. Paul_Murphy

    Wow - good going guys and gals.

    Stunning results already - hopefully they will be confirmed and Kepler will mirror Hubbles range of discoveries.

    What with the LHC doing it's stuff well above spec. it's an interesting time to be following these.

    I still want my flying car though.

    ttfn

  6. Winkypop Silver badge
    Thumb Up

    Oh noes!

    More planets, a few less gods!

    Why it might turn out that religion is........err.......man made!

    Oh the huge manitee !

  7. Ed Blackshaw Silver badge
    Stop

    Have they ruled out the possibility of a fault?

    When they start measuring planets that are hotter than their host star or have an average density of less then that of expanded polystyrene, my immediate response would be to double check the instruments and the models they are using to calculate these values from the observations, as well as their assumptions about distance of host stars, etc.

    1. twelvebore
      Boffin

      Simple and pretty secure

      The way the density is derived is fairly simple, it's basic geometry and Newtonian physics. The major uncertainty comes from estimating the size and mass of the host star, and typically it's less than about 10% in each of those - certainly well enough understood to know that these exceptional planet densities are highly unlikely to be due to errors. Put it this way - if these estimates are way off then we seriously misunderstand how our Earth orbits our Sun!

      1. Ed Blackshaw Silver badge
        Boffin

        However...

        The parameters for our own solar system are fairly well known. For example, the size, distance from Earht and temperature of the Sun are known to a fairly decent precision.

        When you start talking about distant objects, things like distance are calculated indirectly from such arcane things as red-shifts in the star's spectrum, which in turn tells us how fast it is moving from us, and from that, teh distance is estimated. Estimates of size are based upon brightness and distance, and models of how types of star other than our sun are supposed to work. Compound the errors in these various methods, and values become somewhat less determinate.

        What I am suggesting is that if there is a flaw in any of the models used to calculate these things (for example a solar system is moving at a different speed to that expected for its distance, thus altering the red-shift), then the assumptions that have been made in the calculations of the star's distance, size and temperature are invalid.

    2. Anonymous Coward
      Anonymous Coward

      I'm assuming they do

      But not knowing the exact methods they employ it makes me wonder too.

    3. ravenviz Silver badge
      Flame

      Cold Sun

      We did a radio astronomy experiement when I was an undergraduate and concluded the (visible) surface of the Sun was 4 Kelvin! Our professor said this was a valuable result as it was within three orders of magnitude!

  8. The old man from scene 24
    Paris Hilton

    Huh?

    "The size of planets can be estimated from measuring the size of the dip, and their temperatures by the type of star it orbits and the planet's orbital period."

    How does temperature affect orbital period? Either this is a mistake or there's some really interesting and clever physics behind it. Either way, people should be told.

    Paris because she knows all about bodies orbiting stars.

    1. twelvebore
      Boffin

      Other way round

      The orbital period (or more intuitively the distance from the star to the planet*) determines the planet temperature, not the other way round. Basically the closer they are to the star, the more energy they receive from it.

      (*) orbital distance and orbital period are closely related through Keplers Laws.

    2. ravenviz Silver badge
      Stop

      Orbital period

      I think the assumption is that the temperature is a function of the orbital period given the further it is away from the host star then the colder it is.

      1. Ed Blackshaw Silver badge
        Troll

        If this is the case

        Then can we assume that the planet with a higher temperature than its star is in a retrograde orbit, so they calculated its distance from the star as negative?

  9. The old man from scene 24
    Paris Hilton

    @twelvebore

    Ah, that makes some sense. So the temperature is calculated, based on a steady state assumption, rather than measured. But that doesn't fit th statement below, which implies a measurement which doesn't match the theoretical calculation:

    "For example, Kepler found celestial objects that are hotter than the host stars they orbit."

    Paris because she knows all about hot bodies.

  10. Sysgod

    Life everywhere!

    If we advance suffciently in technology to reach these planets easily, then likely we'll have the technology to move them into orbits that can support life. ...oh wait... ...the Lavamen have already been doing this in the universe for billions of years...

  11. Fluffykins Silver badge

    That's not Styrofoam!

    It's MERINGUE!

  12. Michael 82
    Alien

    Why look into space?

    We already have 11 forms of aliens living under Dulce and Area51. If you believe whatever you read... Ask the US, but they wont admit it..... Welcome to our 'Draco' overlords ;)

    Mines the one with the styrofoam firing flash gun in the pocket.

  13. Graham Marsden
    Boffin

    "discoveries rolling off the assembly line"

    Err, mixing your metaphors much, lads...?

  14. MajorTom

    Maybe...

    "For example, Kepler found celestial objects that are hotter than the host stars they orbit."

    Could it be a bunch of small stars orbiting a really heavy planet?

  15. Destroy All Monsters Silver badge
    Coat

    Mysterious superhot dwarfs?

    Obviously planets on which someone switched on an LHC.

  16. Destroy All Monsters Silver badge
    Dead Vulture

    Okay El Reg, Fess Up!

    Are you making up the stuff about the superhot mini? I can't find a mention of that one on the NASA website. Unfortunately I don't have access to the not-yet-peer-reviewed papers either...

  17. mosw
    Alien

    Styrofoam planet = Dyson sphere?

    Maybe the planet density is so low because it is hollow. Not really a Dyson sphere but not sure what to call it. So given the outside temperature how cool could the inside be kept?

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