Loading ...
Sorry, an error occurred while loading the content.

New Type of Alien Planet Is a Steamy 'Waterworld'

Expand Messages
  • mahtezcatpoc
    http://www.space.com/14634-alien-planet-steamy-waterworld-gj1214b.html New Type of Alien Planet Is a Steamy Waterworld SPACE.com Staff Date: 21 February 2012
    Message 1 of 1 , Feb 21, 2012

      New Type of Alien Planet Is a Steamy 'Waterworld'
      SPACE.com Staff
      Date: 21 February 2012 Time: 11:09 AM ET

      Scientists have discovered a new type of alien planet — a steamy waterworld that is larger than Earth but smaller than Uranus.

      The standard-bearer for this new class of exoplanet is called GJ 1214b, which astronomers first discovered in December 2009. New observations by NASA's Hubble Space Telescope suggest that GJ 1214b is a watery world enshrouded by a thick, steamy atmosphere.

      "GJ 1214b is like no planet we know of," study lead author Zachory Berta of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass., said in a statement. "A huge fraction of its mass is made up of water."
      Adding to the diversity

      To date, astronomers have discovered more than 700 planets beyond our solar system, with about 2,300 more "candidates" awaiting confirmation by follow-up observations.

      These alien planets are a diverse bunch. Astronomers have found one planet as light and airy as Styrofoam, for example, and another as dense as iron. They've discovered several alien worlds that orbit two suns, like Luke Skywalker's home planet of Tatooine in the "Star Wars" films. [The Strangest Alien Planets]

      But GJ 1214b, which is located 40 light-years from Earth in the constellation Ophiuchus (The Serpent Bearer), is something new altogether, researchers said.

      This so-called "super-Earth" is about 2.7 times Earth's diameter and weighs nearly seven times as much as our home planet. It orbits a red-dwarf star at a distance of 1.2 million miles (2 million kilometres), giving it an estimated surface temperature of 446 degrees Fahrenheit (230 degrees Celsius) — too hot to host life as we know it.

      Scientists first reported in 2010 that GJ 1214b's atmosphere is likely composed primarily of water, but their findings were not definitive. Berta and his team used Hubble's Wide Field Camera 3 to help dispel the doubts.

      Hubble watched as GJ 1214b crossed in front of its host star, and the scientists were able to determine the composition of the planet's atmosphere based on how it filtered the starlight.

      "We're using Hubble to measure the infrared color of sunset on this world," Berta said. "The Hubble measurements really tip the balance in favor of a steamy atmosphere."

      Berta and his colleagues report their results online in the Astrophysical Journal.
    Your message has been successfully submitted and would be delivered to recipients shortly.