None of the giant planets
imaged were around sun-like stars.
This is why the research team from the University of California, Riverside, looked up and identified these 121 giant planets
By providing specific constraints on when precisely giant planets
become "bad neighbors," Georgakarakos, Eggl, and Ian Dobbs-Dixon, NYUAD assistant professor of physics, were able to identify prime targets in the ongoing search for a "second Earth." "The general idea is the farther away the giant planet
is from the habitable zone, the better.
As Jupiter moved inward, however, gravitational perturbations from the giant planet
would have swept the inner planets (and smaller planetesimals and asteroids) into close-knit, overlapping orbits, setting off a series of collisions that smashed all the nascent planets into pieces.
Heller and Barnes show that a moon needs to be roughly the mass of Earth to maintain an atmosphere and a magnetic field that could deflect deadly radiation from the giant planet
next door and other sources.
Juno's launch is scheduled for August 5 and will take five years to reach the giant planet
Previously, the only gas giant planet
found to travel around a star in a near circular orbit, at three Earth-Sun distances, was the outer planet of the 47 UrsaMajoris system.
The research completely contradicts the widely held assumption that it takes at least one million years for gas giant planets
like Jupiter and Saturn to evolve.
The researchers identified 121 giant planets
that have orbits within the habitable zones of their stars.
However, this process acts too slowly to grow giant planets
far from their star.
The core of this new work is in the calculation of the size of the magnetospheres of giant planets
that are located in the habitable zones of their host stars.
But last October, when astronomer Hal Levison presented what he called a "slightly radical" mechanism for building the solar system's giant planets
, he was ready.