However, Jovian planets begin as large, icy planetesimals, which then capture hydrogen and helium gas from the solar nebula.
12.
"' 23 Librae b "'( 23 Lib b ) is an extrasolar Jovian planet discovered in 1999 orbiting the star 23 Librae.
13.
This also suggested that some Jovian planets could have longer formation time scales of up to 10 million to 20 million years.
14.
"' HD 4113 b "'is a jovian planet located approximately 144 light-years away in the constellation of AU from the parent star.
15.
Moving on to the planet itself, we find that despite being one of the four Jovian planets, Saturn is somewhat different from the others.
16.
Beta Pictoris b's distance from its star is 9 AU . At such distances the rotation of Jovian planets is not slowed by tidal effects.
17.
With a lower mass bound of 4.2 times the mass of the Earth, HD 40307 b is presumably too small to be a jovian planet.
18.
However, he added, " if that's not the case, then we have a Jovian planet closer to its star than Mercury is to the sun.
19.
As is typical of Jovian planets, Saturn also has a large number of moons-at least 22 at last count, 18 of which have been named.
20.
The chief assumption about habitable planets is that they are Ian Stewart evaluate plausible scenarios in which life might form in the cloud-tops of Jovian planets.
