A NASA spacecraft has found an unusual three-planet system that
consists of one super-Earth and two Neptune-size worlds orbiting
a star similar to our sun, a new study reveals. The planet-
hunting Kepler Space Telescope discovered the three planets
around the star Kepler-18, which is only 10 percent larger than
the sun and contains 97 percent of the sun's mass, researchers
from the University of Texas at Austin said. The alien system
could also host more planets than have been found so far, they
added. Space news from NBCNews.com Teen's space mission fueled
by social media Science editor Alan Boyle's blog: "Astronaut
Abby" is at the controls of a social-media machine that is
launching the 15-year-old from Minnesota to Kazakhstan this
month for the liftoff of the International Space Station's next
crew. - Buzz Aldrin's vision for journey to Mars - Giant black
hole may be cooking up meals - Watch a 'ring of fire' solar
eclipse online - Teen's space mission fueled by social media All
three planets, which are desi