Are we not the only Earth out there?

  Prev Next  


The Ultimate Space Race Quiz

The Ultimate Space Race Quiz

The race for space between the U.S. and the USSR was more than just another contest. Test your knowledge about The Great Space Race at HowStuffWorks.

Related Articles

More Great Links


  • "Found 20 light years away: the new Earth." Daily Mail. April 26, 2007.
  • "Hunting for another Earth-like planet." BBC News. Aug. 7, 2007.
  • Clavin, Whitney. "NASA's Kepler Confirms Its First Planet In Habitable Zone." Jet Propulsion Laboratory. Dec. 5, 2011. (Feb. 8, 2012)
  • Courtland, Rachel. "Is first life-friendly exoplanet an 'eyeball'?" NewScientist. Jan. 13, 2011. (Feb. 8, 2012)
  • Dunham, Will. "Burned-out star harbors sign of Earthlike planets." Reuters. Aug. 16, 2007.
  • NASA. "White dwarfs." December 2010.
  • Nelson, Bryn. "Black Plants and Twilight Zones." Scientific American. December 2010.
  • Planet Quest: The Search for Another Earth. Jet Propulsion Laboratory. (Feb. 8, 2012)
  • Reich, Eugenie Samuel. "Beyond the Stars." Nature. Vol. 470, February 2011.
  • Reuters. "White dwarf harbors signs of Earth-like planets." Aug. 17, 2007.
  • Sasselov, Dimitar D. and Diana Valencia. "Planets We Could Call Home." Scientific American. August 2010.
  • Stephens, Tim. "New super-Earth detected within the habitable zone of a nearby star." University of California Santa Cruz. Feb. 2, 2012. (Feb. 8, 2012)
  • Than, Ker. "Newfound Planet Has Earth-Like Orbit." Aug. 2, 2007.
  • Than, Ker. "Scientists find most Earthlike planet yet." MSNBC. April 25, 2007.
  • Villard, Ray and Kailash Sahu. "The Milky Way Contains at Least 100 Billion Planets According to Survey." HubbleSite News Center. Jan. 11, 2012. (Feb. 8, 2012)