Objects closer to Earth than the L1 point are controlled by Earth's gravity. Objects beyond the L1 point are controlled by the Sun. When J002E3 came close to the L1 point in April 2002, the object passed throuhgh L1--like a portal--from a Sun-orbit to an Earth-orbit.
In the top 20km of the Earth's crust, the conditions are right to produce a nearly inexhaustible supply of hydrogen, said Prof Freund. Studies by the team of common rock types such as granite and olivine have revealed extraordinarily high levels of trapped hydrogen.
no, it is not. Hydrogen is made from oil or coal. You can take a renewable energy source and turn it into hydrogen, but the renewable source is wasted. For every 100 units of energy you put into making H2, you get 50 units of H2 energy, so you waste 50% of your energy.