| 1 | The smaller Rocky worlds are Mercury, Venus, Earth and Mars. The four huge gas planets are Jupiter, Saturn, Uranus and Neptune. | |
| 2 | Other large, hot Jupiter-type planets can be characterized and compared using existing instruments, Swain said. | |
| 3 | It may represent a new class of failed stars straddling the division between stars and Jupiter-like planets. | |
| 4 | " Carr adds that these are critical details for "understanding the details of how both Earth-like and Jupiter-like planets are formed. | |
| 5 | In this case, the formation of Jupiter-mass worlds may only take a few thousand years to form, well before the planet-building materials are ejected from the system. |
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