


Kepler scientists have another 2,300 candidate planets awaiting additional confirmation.

None of the newly discovered planetary systems are like our solar system, though Kepler-33, a star that is older and bigger than the Sun, comes close in terms of sheer numbers. It has five planets, compared to our solar system's eight, but the quintet all fly closer to their parent star than Mercury orbits the Sun.

The planets range in size from about 1.5 times the diameter of Earth to five times Earth's diameter. Scientists have not yet determined if any are solid rocky bodies like Earth, Venus, Mars and Mercury or if they are filled with gas like Jupiter, Saturn, Uranus and Neptune.

The Kepler team previously found one star with six confirmed planets and a second system with five planets, said planetary scientist Jack Lissauer, with NASA's Ames Research Center in Moffett Field, California.


"This has tripled the number of stars which we know have more than one transiting planet, so that's the big deal here," Lissauer told Reuters.

"We're starting to think in terms of planetary systems as opposed to just planets: Do they all tend to have similar sizes? What's the spacing? Is the solar system unusual in those regards?" he said.

