Hydrogen is not from any planet.
Hydrogen was formed in the earliest times of the universe. It is primordial.
78% of ordinary matter in the universe is Hydrogen with most of the rest being Helium.
As time went on clouds of hyrdrogen collapsed and formed stars. In the centre of these stars the hydrogen and helium were converted to other elements like silicon and oxygen and iron. It is from these elements that planets were formed later.
So far from hydrogen being from a planet, planets are made from hydrogen.
To ignite nuclear fusion, a certain temperature is required; and this, in turn, requires a certain mass. A large planet (or more precisely, a massive planet) could become a star if it acquires additional mass. Note that there is an intermediate stage, the brown dwarf - which is basically an object that is massive enough for the fusion of deuterium (hydrogen-2), but not massive enough to fuse regular hydrogen (hydrogen-1). Deuterium is much rarer than the regular hydrogen.
Saturn is a "gas giant" planet, made primarily of hydrogen. It probably does not have anything that could be called a "surface".
The planet Jupiter contain approx. 90 % hydrogen.
Saturn is made up of hydrogen
Jupiter is the planet with the most abundant hydrogen gas in its atmosphere. It is composed mostly of hydrogen and helium, with hydrogen making up about 90% of the gas in its atmosphere.
Nowhere as the planet is composed of over 95% hydrogen
No.jupiter is a gas planet. it is mostly made from hydrogen, helium and methane.
Hydrogen
Jupiter.
Theoretically it could happen, but as a result of solar radiation such a planet will be blown away within a few thousand years. An earth-sized body of hydrogen and helium wouldn't have the mass to create the gravity to hold the whole thing together for any length of time under the influence of the solar wind.
Hydrogen (93%)
A Star converts hydrogen into energy by nuclear fusion. A planet does not