A brown dwarf stellar object (13.5 - 80 Jovian masses) or a lone "planet".
A planet technically is defined as "an object that orbits a star and is able to become a sphere by gravity and has cleared it orbital neighbourhood of other objects" but I do not know of a term that describes a planet size object that does not orbit a star.
The planets in the solar system are formed by fragment of the original cloud.
the law of conservation of angular momentum Edit: I think it's more likely to be " The Law of Conservation of Energy". Gravitational energy gets changed into heat energy.
The Sun (and all the planets) started their lives in a giant cloud of cold molecular gas and dust. And then about 4.6 billion years ago, something bumped into the cloud, like the gravity from a passing star, or shockwaves from a supernova, causing the cloud to collapse. With the collapse, the mutual gravity from the particles in the cloud pulled together, and formed pockets of denser material in the cloud. These were star forming regions, and one of them was to become the Solar System.
tornado clouds
In order for a clump of matter in a gas cloud to become a star, it must be a whopping BIG gas cloud, so that the mutual gravitation of the cloud would cause it to collapse in on itself. There are some theories that a large and diffuse gas cloud would be unlikely to spontaneously collapse under its own gravity without some substantial shock to the gas cloud. The shock wave of a nearby supernova explosion would not only provide the shock, but also contribute a substantial amount of newly-created heavy elements to the system. Such a supernova five billion years ago probably provided a lot of the iron, gold and uranium to our solar system, and also caused our stellar nebula to collapse, forming our Sun and our planetary system.
The cloud fragment could be glowing due to a heavenly body which is behind it.
The gas cloud will become a brown dwarf because it did not make the 10 million kelvin in order to start nuclear fusion. :)
Gravity.
The planets in the solar system are formed by fragment of the original cloud.
Well first it turns into a cloud the when the cloud becomes to heavy the water falls and becomes rain
the law of conservation of angular momentum Edit: I think it's more likely to be " The Law of Conservation of Energy". Gravitational energy gets changed into heat energy.
it becomes a tornado
The cloud must radiate a lot of its thermal energy.
Evaporation and condensation transport water from the ocean into a cloud.
Nebula
it collapse after two planes hit it
A star is formed out of cloud of cool, dense molecular gas. In order for it to become a star, the cloud needs to collapse and increase in density.