Astronomers say they have discovered what appears to be an entirely new kind of planet, an extra-large gas giant unlike any known world in our solar system or beyond. "This questions our understanding of how giant planets are formed and evolve," said Robert Noyes, a senior physicist at the Harvard-Smithsonian Center for Astrophysics (CfA). The planet, dubbed HAT-P-1, is located some 450 light-years from Earth in the constellation Lacerta. It is the largest planet ever discovered and boasts a radius nearly 1.4 times larger than Jupiter's. HAT-P-1 is also the least dense of all known planets. "This planet is about one quarter the density of water," said Gaspar Bakos, a Hubble fellow at CfA. "In other words, it's lighter than a giant ball of cork. Just like Saturn, it would float in a bathtub if you could find a tub big enough to hold it, but it would float almost three times higher." Unlike more familiar gas giants, including those in our solar system, HAT-P-1 does not appear to have a solid core. The planet's large size and low density can't be explained by current theories of giant planet formation. Scientists suggest that additional heat in its interior could account for its "puffed-up" size, but as yet they can't explain how such heat could be generated.
Jupiter is both the largest and the most massive planet in our Solar System.
pluto
The largest object in the solar system is not a planet. It is the Sun. The largest planet is Jupiter.
Uranus is the third largest planet in the solar system.
The largest planet in our solar system is Jupiter.
In our solar system, the planet Jupiter is the largest - at over 1,300 times the volume of Earth (and over 300 times the mass).
The largest planet in our solar system is Jupiter.
Jupiter is the largest planet in the solar system.
The largest object in the solar system is not a planet. It is the Sun. The largest planet is Jupiter.
No, Venus is not largest planet in our solar system. Jupiter is the largest planet in our solar system.
Uranus is the third largest planet in the solar system.
The largest planet in the solar system is Jupiter.
The largest planet in the solar system is Jupiter.
No. Jupiter is the largest planet in our Solar System. Saturn is the second largest.
Jupiter is the largest planet of the solar system. The second largest is Saturn.
No, Earth is the fifth largest planet in our solar system.
The largest planet in our solar system is Jupiter.
Yes it is, the largest planet in our solar system.
No. Jupiter is the largest planet in the solar system. Mars is the second smallest.